docs: add CONTRIBUTING.md

Author: Mivik

CONTRIBUTING.md

@@ -0,0 +1,15 @@
+
+# Contributing
+
+Great to see you here! Your voluntary contributions are highly appreciated. Here are some tips for you to get started.
+
+## Issue reporting
+
+If you find any bugs or have any suggestions, feel free to [open an issue](https://github.com/Mivik/bijou/issues). It would be great if you can provide as much information as possible, such as reproduction steps, error messages, etc.
+
+## Discussion
+
+If you're not sure about something, feel free to [open a discussion](https://github.com/Mivik/bijou/discussions). Discussions are also a good place to share your ideas or feature requests.
+
+## License
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you shall be under the terms and conditions of Apache-2.0, without any additional terms or conditions.

README.md

@@ -47,6 +47,10 @@ Bijou might be slower in cases where directory structure or file metadata is fre
 
 See [security](docs/security.md) and [design](docs/design.md) for more information.
 
+## Get Involved
+
+Bijou is still in its early stage, and there are many things to do. If you're interested in this project, check out [CONTRIBUTING.md](CONTRIBUTING.md). Any contribution is welcome!
+
 ## Installation
 
 ```bash