Add README

Author: T-Pham

README.md

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+<h1 align="center">ReactBrightScript</h1>
+
+<div align="center">
+	React-like framework for Roku
+</div>
+
+## Usage
+
+- Copy the files in `components/react` to your project.
+- Extend the `React`* components.
+- Override component lifecycle functions as needed. `render`, `componentDidUpdate`, `componentWillUnmount`, `shouldComponentUpdate` are available.
+- Call `mapFieldsToProps` function to map properties under `m.top` to `m.props`.
+- Call `unmountComponent` to unmount a component.
+
+## Caveat
+
+This framework is in beta. Future changes to the framework may not be backwards compatible.
+
+
+## License
+ReactBrightScript is licensed under the
+MIT License. See [LICENSE.txt](LICENSE.txt) for details.