Add basic ReadMe.md

ReadMe.md

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+# Build Godot
+
+This action builds the godot project in your `$GITHUB_WORKSPACE`, so that you can easily automate builds.
+
+## Usage
+
+Example:
+
+```yaml
+steps:
+- uses: josephbmanley/build-godot-action@develop
+  env:
+    PROJECT: godot-project
+```
+
+### Environment Variables
+
+- #### PROJECT **REQUIRED**
+
+    Name of the project files to output.
+
+    Eg. `godot-project` will export to `godot-project.exe`
+
+## Credits
+
+This action uses the [godot-ci](https://github.com/aBARICHELLO/godot-ci) docker image from [BARICHELLO](https://github.com/aBARICHELLO)