Added a readme file

Author: Shamin Meerankutty

README.md

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+# react-fullscreen-loading
+Minimal fullscreen loading for react
+
+## Installation
+
+```
+npm install --save react-fullscreen-loading
+```
+
+## Example
+
+```javascript
+import React from 'react';
+import Loading from 'react-fullscreen-loading';
+
+class App extends React.Component {
+  render() {
+    return(
+      <Loading loading background="#2ecc71" loaderColor="#3498db" />
+    )
+  }
+}
+
+export default App;
+```