docs: add contributing guideline (#26)

CODE_OF_CONDUCT.md

+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+- The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at contact@yanglibin.info. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

+# Contributing to Us
+
+Welcome to Doocs! This document is a guideline about how to contribute to qcloud-im-server-sdk-java.
+If you find something incorrect or missing, please leave comments / suggestions.
+
+## Before you get started
+
+### Code of Conduct
+
+Please make sure to read and observe our [Code of Conduct](./CODE_OF_CONDUCT.md).
+
+### Setting up your development environment
+
+You should have JDK 1.8 or later installed in your system.
+
+## Contributing
+
+We are always very happy to have contributions, whether for typo fix, bug fix or big new features.
+Please do not ever hesitate to ask a question or send a pull request.
+
+We strongly value documentation and integration with other projects.
+We are very glad to accept improvements for these aspects.
+
+### GitHub workflow
+
+We use the `dev` branch as the development branch, which indicates that this is a unstable branch.
+
+Here are the workflow for contributors:
+
+1. Fork to your own
+2. Clone fork to local repository
+3. Create a new branch and work on it
+4. Keep your branch in sync
+5. Commit your changes (make sure your commit message concise)
+6. Push your commits to your forked repository
+7. Create a pull request
+
+After creating a PR, one or more reviewers will be assigned to the pull request.
+The reviewers will review the code.
+
+Before merging a PR, squash any fix review feedback, typo, merged, and rebased sorts of commits.
+The final commit message should be clear and concise.
+
+## Community
+
+### Contact us
+
+#### Mailing list
+
+If you have any questions or advice, please send an email to [contact@yanglibin.info](mailto:contact@yanglibin.info).
+
+#### Discussions
+
+https://github.com/doocs/qcloud-im-server-sdk-java/discussions

README.md

 # Tencent Cloud IM Server SDK in Java
 
-[![license](https://img.shields.io/github/license/doocs/qcloud-im-server-sdk-java?color=42b883&style=flat-square)](./LICENSE)
+<a href="https://search.maven.org/artifact/io.github.doocs/im-server-sdk-java"><img src="https://img.shields.io/maven-metadata/v?color=42b883&metadataUrl=https%3A%2F%2Frepo1.maven.org%2Fmaven2%2Fio%2Fgithub%2Fdoocs%2Fim-server-sdk-java%2Fmaven-metadata.xml&style=flat-square" alt="maven"></a>
+<a href="https://github.com/doocs/qcloud-im-server-sdk-java/blob/main/LICENSE"><img src="https://img.shields.io/github/license/doocs/qcloud-im-server-sdk-java?color=42b883&style=flat-square" alt="license"></a>
+<a href="https://doocs.github.io/#/?id=how-to-join"><img src="https://img.shields.io/badge/organization-join%20us-42b883?style=flat-square" alt="open-source-organization"></a>
 
 ## Installation and Getting Started
 
@@ -12,7 +14,7 @@ Add the Maven dependency:
 <dependency>
   <groupId>io.github.doocs</groupId>
   <artifactId>im-server-sdk-java</artifactId>
-  <version>0.0.2</version>
+  <version>0.0.3</version>
 </dependency>
 ```
 
@@ -37,9 +39,9 @@ public class Main {
 
         // import account
         AccountImportRequest request = new AccountImportRequest();
-        request.setFaceUrl("https://avatars.githubusercontent.com/u/21008209?v=4");
-        request.setIdentifier("ylb");
-        request.setNick("nickname");
+        request.setFaceUrl("https://avatars.githubusercontent.com/u/43716716?s=200&v=4");
+        request.setIdentifier("doocs");
+        request.setNick("Doocs Community");
         try {
             AccountImportResult result = client.account.accountImport(request);
             System.out.println(result);
@@ -50,6 +52,10 @@ public class Main {
 }
 ```
 
+## Contributing
+
+Contributions are always welcomed! Please refer to [CONTRIBUTING](./CONTRIBUTING.md) for detailed guidelines.
+
 ## License
 
-Apache 2.0 license.
+Apache-2.0 License.

pom.xml

@@ -26,18 +26,21 @@
             <name>yanglbme</name>
             <email>contact@yanglibin.info</email>
             <url>https://github.com/yanglbme</url>
+            <organization>doocs</organization>
         </developer>
         <developer>
             <id>hongyiheng</id>
             <name>hongyiheng</name>
             <email>hongyihengg@gmail.com</email>
             <url>https://github.com/hongyiheng</url>
+            <organization>doocs</organization>
         </developer>
         <developer>
             <id>xy</id>
             <name>xy</name>
             <email>502400992@qq.com</email>
             <url>https://github.com/YXxy1002</url>
+            <organization>doocs</organization>
         </developer>
     </developers>
 
@@ -45,6 +48,10 @@
         <name>Doocs Community</name>
         <url>https://github.com/doocs</url>
     </organization>
+    <issueManagement>
+        <system>github</system>
+        <url>https://github.com/doocs/qcloud-im-server-sdk-java</url>
+    </issueManagement>
 
     <distributionManagement>
         <snapshotRepository>