Add initial version

README.md

@@ -2,13 +2,57 @@
 [![Actions status](https://github.com/WebberTakken/unity-activate/workflows/Actions%20%F0%9F%98%8E/badge.svg)](https://github.com/WebberTakken/unity-activate/workflows/Actions%20%F0%9F%98%8E/badge.svg)
 
 [Github Action](https://github.com/features/actions)
-to activate Unity using a personal or professional license. 
+to activate Unity using credentials or a license file. Both **personal** and 
+**professional** licenses are supported.
 
-Use this action to verify whether your license file is correctly configured.
-
-If so, you will be able to run the 
+Use this action to verify whether your license file is correctly configured. If 
+so, you will be able to run the 
 [Test](https://github.com/webbertakken/unity-actions#test) and
 [Build](https://github.com/webbertakken/unity-actions#build)
 actions from the 
 [Unity Actions](https://github.com/webbertakken/unity-actions) 
 collection too.
+
+
+## Usage
+
+#### Personal license
+
+1. Follow the **activation** section from [request action](https://github.com/marketplace/actions/unity-request-activation-file) to set `UNITY_LICENSE` variable.
+2. Use the action as follows:
+
+```yaml
+- name: Activate Unity
+  uses: webbertakken/unity-activate@v1
+  env:
+    UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
+```
+
+#### Professional license
+
+1. Goto `Repository` > `Settings` > `Secrets`
+2. Set the following secrets:
+    - `UNITY_EMAIL`: <your_unity_login_email_address>
+    - `UNITY_PASSWORD`: <your_unity_login_password>
+    - `UNITY_SERIAL`: <your_unity_serial>
+3. Use the action as follows:
+
+```yaml
+- name: Activate Unity
+  uses: webbertakken/unity-activate@v1
+  env:
+    UNITY_EMAIL:    ${{ secrets.UNITY_EMAIL }}
+    UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
+    UNITY_SERIAL:   ${{ secrets.UNITY_SERIAL }}
+```
+
+_**Note:** I was not able to verify these steps as i don't have a pro license. Feel free 
+to give 
+[feedback](https://github.com/webbertakken/unity-activate/issues/new) or 
+[contribute](https://github.com/webbertakken/unity-activate)._
+
+## More actions
+
+Visit 
+[Unity Actions](https://github.com/webbertakken/unity-actions) 
+to find related actions for Unity.