Add Simple Test Case with testing-library

Author: Shubham Dhage

README.md

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+### Simple React Native Typescript with Jest Testing Library
+
+* npx react-native init MyApp --template react-native-template-typescript
+
+* npm install --save @testing-library/react-native @testing-library/jest-native
+
+* Official Docs - https://testing-library.com/docs/
+
+* npm run test --watch