[README.md] initial draft of documentation

Author: chrissimpkins

README.md

@@ -1 +1,57 @@
-# py-dependency-install
+# py-actions/py-dependency-install GitHub Action
+
+This GitHub Action installs Python package dependencies from a user-defined `requirements.txt` file path with optional `pip`, `setuptools`, and `wheel` installs/updates during execution.
+
+## Inputs
+
+### `path`
+
+**Optional** The `requirements.txt` file path relative to the root of your source repository. Default = `"requirements.txt`.
+
+### `update-pip`
+
+**Optional** A boolean string indicating that a `pip` package update should occur before the dependency installation. Options: [`"true"`, `"false"`].  Default=`"true"`
+
+### `update-setuptools`
+
+**Optional** A boolean string indicating that a `setuptools` package update should occur before the dependency installation. Options: [`"true"`, `"false"`].  Default=`"false"`
+
+### `update-wheel`
+
+**Optional** A boolean string indicating that a `wheel` package update should occur before the dependency installation. Options: [`"true"`, `"false"`].  Default=`"false"`
+
+## Outputs
+
+None
+
+## Example usage
+
+### Default
+
+Uses path `requirements.txt` and updates `pip` before the install.
+
+```yaml
+uses: py-actions/py-dependency-install@v1
+```
+
+### Disable `pip` update before install
+
+```yaml
+uses: py-actions/py-dependency-install@v1
+with:
+  update-pip: "false"
+```
+
+### Configure `setuptools` and `wheel` installs/updates
+
+```yaml
+uses: py-actions/py-dependency-install@v1
+with:
+  update-pip: "true"
+  update-setuptools: "true"
+  update-wheel: "true"
+```
+
+## License
+
+[Apache License, v2.0](LICENSE)