update readme

Author: Kashish Grover

README.md

@@ -2,9 +2,17 @@
 
 Problem Statement:
 
-To create a simple example for an e-commerce app.
+To create a simple example for a React Native e-commerce app.
 
 1. Create a simple login screen with a hard coded id and password
 2. Create a generic list screen using the following api link: [add API link here]
 3. On clicking a particular product, display a details screen with details from [add API link here]
 
+Concepts covered:
+1. RN Components (View, Text, Image, ScrollView, KeyboardAvoidingView, etc.)
+2. Styling
+3. AsyncStorage
+4. Linting Setup
+5. React Navigation - Stack and Drawer Navigators
+6. Passing props while navigating
+7. Using internal state