Add README

Author: DaniAkash

README.md

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+# react-native-responsive-dimensions
+
+Responsive height, width and responsive fontSize for react native components that automatically adjust themselves based on the screen size of the device. The dimensions can be used for any components like View, Image, Text etc.
+
+Installation
+```sh
+#npm
+npm install --save react-native-responsive-dimensions
+
+#yarn
+yarn add react-native-responsive-dimensions
+```
+
+The below snippet will create styles with a container of dynamic height, width and a sample text with dynamic font-size relative to the screen size of the device the app is run.
+
+```js
+import { StyleSheet } from 'react-native';
+import { responsiveHeight, responsiveWidth, responsiveFontSize } from 'react-native-responsive-dimensions';
+
+const styles = StyleSheet.create({
+  container: {
+    justifyContent: 'center',
+    height: responsiveHeight(50),
+    width: responsiveWidth(50),
+    alignItems: 'center',
+  },
+  sampleText: {
+    fontSize: responsiveFontSize(2),
+  }
+});
+```
+
+This will create a container(view/image) with height that is exactly 50% of the device's screen-height and width exactly 50% of the device's screen-height and a font with fontSize that occupies exactly 2% of the screen size.
+
+License
+----
+
+MIT