Add license and test step

activate/README.md

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+# Activate Unity
+
+Activates personal of professional license of unity.
+
+## Usage
+
+#### Personal license example
+
+1. Goto `Repository` > `Settings` > `Secrets`
+2. Create a new secret called `UNITY_LICENSE`
+3. Find the license file:
+    - Windows: `C:/ProgramData/Unity/Unity_lic.ulf`
+    - MacOS: `/Library/Application Support/Unity/Unity_lic.ulf`
+4. Copy the contents into the value field of the secret `UNITY_LICENSE`
+5. Use the action as follows:
+
+```yaml
+- name: Activate Unity
+  uses: webbertakken/unity-actions/activate@master
+  env:
+    UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
+```
+
+#### Professional license example
+
+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-actions/activate@master
+  env:
+    UNITY_EMAIL:    ${{ secrets.UNITY_EMAIL }}
+    UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
+    UNITY_SERIAL:   ${{ secrets.UNITY_SERIAL }}
+```