docs: update contributing (#1520)

CONTRIBUTING.md

@@ -3,3 +3,73 @@
 Please read the following document.
 
 - https://github.com/suzuki-shunsuke/oss-contribution-guide
+
+## Requirements
+
+- [aqua](https://aquaproj.github.io/): CLI Version Manager
+  - [cmdx](https://github.com/suzuki-shunsuke/cmdx): Task Runner
+- Node.js
+  - [prettier](https://prettier.io/): Formatter
+
+Install cmdx by aqua.
+
+```sh
+aqua i -l
+```
+
+After you update code, you have to run the following things.
+
+- Build TypeScript
+- Test JavaScript Action
+- Format code
+- Update [JSON Schema](schema) and [document](https://suzuki-shunsuke.github.io/tfaction/docs/)
+
+## Build TypeScript
+
+```sh
+npm run build
+```
+
+Build all JavaScript Actions.
+If you update [lib](lib), you have to run this command.
+
+```sh
+cmdx build
+```
+
+## Test JavaScript Actions
+
+```sh
+npm t
+```
+
+## Format code
+
+```sh
+cmdx fmt
+```
+
+## Manual test
+
+We provide some automatic tests such as unit tests, but sometimes the automatic tests aren't enough so you have to test your changes on your environment.
+You have to build GitHub Actions workflows with tfaction and test your changes on the workflows.
+
+When a pull request is created or updated, the branch `pr/<pull request number>` is also created or updated by GitHub Actions.
+
+- https://github.com/suzuki-shunsuke/tfaction/actions/workflows/create-pr-branch.yaml
+- https://github.com/suzuki-shunsuke/tfaction/blob/main/.github/workflows/create-pr-branch.yaml
+
+> [!WARNING]
+> These branches aren't created and updated against pull requests from fork repositories.
+> Maintainers have to run [the workflow](https://github.com/suzuki-shunsuke/tfaction/actions/workflows/create-pr-branch.yaml) manually.
+
+You can test your pull request version by `pr/<pull request number>`.
+
+For example, if you want to test the pull request [#1513](https://github.com/suzuki-shunsuke/tfaction/pull/1513),
+you can update tfaction's version of your workflows to `pr/1513`.
+
+e.g.
+
+```yaml
+- uses: suzuki-shunsuke/tfaction/setup@pr/1513
+```