doc: update CONTRIBUTING

Author: ymgyt

CONTRIBUTING.md

@@ -1,13 +1,3 @@
-## Pull Requests
-
-If you have a new feature in mind, please discuss the feature in an issue to ensure that your
-contributions will be accepted.
-
-1. Fork the repo and create your branch from `main`.
-2. If you've added code that should be tested, add tests.
-3. If you've changed APIs, update the documentation.
-4. Ensure the test suite passes with `nix flake check`.
-
 ## Commit Message
 
 Commit message should follow [conventional commit](https://www.conventionalcommits.org/en/v1.0.0/).  
@@ -23,8 +13,17 @@ type is one of the following.
 | `refactor`  | refactoring                         |
 | `chore`     | catch all                           |
 
+
+## Development
+
+In syndicationd, we manage the development environment with [Nix](https://nixos.org/).  
+By executing `nix develop`, the necessary tools for development can be prepared.
+
+To test code, execute `just check`
+
+
 ## License
 
-By contributing to `clc`, you agree that your contributions will be dual-licensed under
+By contributing to `syndicationd`, you agree that your contributions will be dual-licensed under
 the terms of the [`LICENSE-MIT`](./LICENSE-MIT) and [`LICENSE-APACHE`](./LICENSE-APACHE) files in the
 root directory of this source tree.