Updated the build process

README.md

@@ -36,6 +36,26 @@ expo start //This will open a window in http://localhost:19002
 ```
 Now you have to open expo app in android and ios and scan the QR code from the metro bundler in http://localhost:19002 ,You will be able run the app now. 
 
+## How to Build?
+
+You can build the app using expo commands:
+
+- For Android
+``` 
+expo build:android -t apk // for building apk
+expo build:android -t app-bundle // for building bundle
+```
+These command directly build your app but you have to create an account on expo. Also for more details regarding building for android you can follow this doc [Expo Android Build Doc](https://docs.expo.io/distribution/building-standalone-apps/#if-you-choose-to-build-for-android). This has a step by step instructions to build your app.
+
+- For IOS
+```
+expo build:ios -t archive // for app store
+expo build:ios -t simulator // for simulation
+```
+Same as of android. Also for more details regarding building for ios you can follow this doc [Expo IOS Build Doc](https://docs.expo.io/distribution/building-standalone-apps/#if-you-choose-to-build-for-ios). This has a step by step instructions to build your app.
+
+*Or you can directly build ios and android app from xcode and android studio directly which is same as you do for standalone app.*
+
 ## Demo Video
 You can watch the small demo video [here](https://drive.google.com/file/d/1Mm8V093ULBbVRPmZH0JZQ6uhasFEbQXB/view?usp=sharing).