Create README.md

Author: ChathurangiShyalika

README.md

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+# ionic3_angular5_rest
+Ionic 3 Consuming REST API using Angular 5 HttpClient. 
+
+To deploy:
+
+-Clone this repository
+-Run 'npm install'
+-Install JSON Server by 'npm install -g json-server'
+-Start JSON Server by 'json-server --watch db.json'
+-Run 'ionic serve --lab' or 'npm run ionic:serve'
+
+If you want to use free REST API testing endpoint from JSONPlaceholder, then replace "apiUrl = 'https://jsonplaceholder.typicode.com'" in 'providers/rest/rest.ts'.