docs: add contributing.md

Author: stainless-app[bot]

CONTRIBUTING.md

@@ -0,0 +1,37 @@
+## Setting up the environment
+
+To set up the repository, run:
+
+```sh
+$ ./scripts/bootstrap
+$ ./scripts/build
+```
+
+This will install required dependencies and build the SDK.
+
+## Modifying/Adding code
+
+Most of the SDK is generated code. Modifications to code will be persisted between generations, but may
+result in merge conflicts between manual patches and changes from the generator. The generator will never
+modify the contents of the `examples/` directory.
+
+## Using the repository from source
+
+To use a local version of this library from source in another project, add it using a directory reference:
+
+```sh
+$ dotnet add reference /path/to/sdk/src/Orb
+```
+
+## Formatting and linting
+
+```sh
+$ ./scripts/format
+$ ./scripts/lint
+```
+
+## Running tests
+
+```sh
+$ ./scripts/test
+```