chore: doc update

Author: farfromrefug

README.md

@@ -4,6 +4,34 @@
 
 Build beautiful, usable products using Material Components for NativeScript.
 
+## Installation
+
+### Android 
+Ensure your Android Theme is inheriting from `MaterialComponents`.
+Inside ```App_resources/android/res/values/styles.xml``` replace all occurences of ```Theme.AppCompat``` with ```Theme.MaterialComponents```
+You can see an example in the demo-vue app.
+
+## Theming
+Defining the theme and the default colors must be done a bit differently on iOS and Android
+
+* **Android**:  You must set the colors through [android Style](https://github.com/material-components/material-components-android/blob/master/docs/getting-started.md#appcompat-themes)
+* **iOS**: You must set the colors programmatically at your app startup
+```typescript
+import { themer } from '@nativescript-community/ui-material-core';
+if (global.isIOS) {
+    themer.setPrimaryColor('#bff937');
+    themer.setAccentColor('#ff8a39');
+    themer.setSecondaryColor('#a830d7');
+}
+```
+
+## Mixins
+Through this component you can apply `elevation` or `rippleColor` to any `View`. To enable that feature your must "install" the mixins. Make sure you do it before creating any view.
+```typescript
+import { installMixins } from '@nativescript-community/ui-material-core';
+installMixins();
+```
+
 ## Components
 
 | Name | README | npm | Material design |