Create CONTRIBUTING.md

A source commit: huanshankeji/gradle-common@c0118b9

CONTRIBUTING.md

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+# Contributing guidelines
+
+Hello, thank you for your interest in contributing to our project.
+
+## Issues and Discussions
+
+You are welcome to submit issues on bugs or feature requests. If you have questions, please ask them in GitHub Discussions.
+
+## Pull requests
+
+If you want to contribute to the code of our project, you are welcome to open pull requests. However, it's always a good idea to open a related issue or talk with us in Discussions first.
+
+## Development
+
+Please make sure you have a valid JDK installed. Some projects may require multiple JDKs of different versions. The JDK version we use can be found in the [GitHub Actions workflow files](.github/workflows).
+
+We recommend developing with IntelliJ IDEA. In IntelliJ IDEA, select the correct [Project SDK in Project Structure](https://www.jetbrains.com/help/idea/project-settings-and-structure.html#project-sdk) and it's recommended to set [Gradle JVM](https://www.jetbrains.com/help/idea/gradle-jvm-selection.html#jvm_settings) to "Project SDK".
+
+Run the `publishToMavenLocal` Gradle task to publish the libraries to your machine's Maven Local Repository so your projects can depend on the changes you have made, run `check` to ensure our limited number of tests pass.
+
+## Furthur notice
+
+We are currently a small team with limited effort. While we may not always implement your requested features, merge your pull requests, or do such things in time, you are always welcome to create your own fork and make any changes you like.