docs: add contributing md

Author: gusye1234

CONTRIBUTING.md

@@ -0,0 +1,19 @@
+# Contributing to nano-graphrag
+
+### Submit your Contribution through PR
+
+To make a contribution, follow these steps:
+
+1. Fork and clone this repository
+3. If you modified the core code (`./nano_graphrag`), please add tests for it
+4. **Include proper documentation / docstring or examples**
+5. Ensure that all tests pass by running `pytest`
+6. Submit a pull request
+
+For more details about pull requests, please read [GitHub's guides](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request).
+
+
+
+### Only add a dependency when we have to
+
+`nano-graphrag` needs to be `nano` and `light`. If we want to add more features, we add them smartly. Don't introduce a huge dependency just for a simple function.

readme.md

@@ -343,6 +343,12 @@ See [ROADMAP.md](./docs/ROADMAP.md)
 
 
 
+## Contribute
+
+`nano-graphrag` is open to any kind of contribution. Read [this](./CONTRIBUTING.md) before you contribute.
+
+
+
 
 ## Benchmark