Add some info into README

Author: foxtran

README.md

@@ -1,3 +1,48 @@
 # Setup Codee
 
 Set up a Codee Formatter & Analyser on Linux and Windows runners.
+
+- [Usage](#usage)
+- [Options](#options)
+- [Environment variables](#environment-variables)
+- [Runner compatibility](#runner-compatibility)
+- [License](#license)
+
+
+## Usage
+
+```yaml
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, ubuntu-24.04-arm]
+
+    steps:
+      - uses: foxtran/setup-codee@v1
+
+      - run: |
+          codee format --help
+```
+
+
+## Options
+
+- *version*: Version of the Codee tools. See [Codee Changelog](https://docs.codee.com/changelog/) to pick the latest.
+
+
+## Environment variables
+
+Action updates PATH environment variable for allowing to use `codee` command.
+
+
+## Runner compatibility
+
+Codee tools are available for Windows x86\_64, Linux x86\_64 and Linux AArch64 platforms.
+
+
+## License
+
+Setup Codee is [MIT licensed](./LICENSE).