[tvOS] Update README.MD (#220)

* [docs] Folder that contains assets for documentation

* [tvOS] Update Readme

Update readme to show how to setup react-native-blur on tvOS

* [Gitignore] Add docs folder

.gitignore

@@ -32,3 +32,6 @@ android/react-native-blur.iml
 
 # Misc
 .idea/
+
+# Assets
+docs/

README.md

@@ -201,6 +201,33 @@ npm install
 react-native run-ios
 ```
 
+#### Run the tvOS app
+
+type:
+```
+react-native run-ios
+```
+
+`react-native link` don’t works properly with the tvOS target so we need to add the library manually.
+
+First select your project in Xcode.
+
+<img src="./docs/tvOS-step-1.jpg" width="40%">
+
+After that, select the tvOS target of your application and select « General » tab
+
+<img src="./docs/tvOS-step-2.jpg" width="40%">
+
+Scroll to « Linked Frameworks and Libraries » and tap on the + button
+
+<img src="./docs/tvOS-step-3.jpg" width="40%">
+
+Select RNBlur-tvOS
+
+<img src="./docs/tvOS-step-4.jpg" width="40%">
+
+That’s all, you can use react-native-blur for your tvOS application
+
 #### Run the Android app
 
 ```