Added readmes

Author: nsingh-branch

README.md

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+# Branch React Native SDK Samples
+
+This repository provides sample applications that demonstrate the use of the Branch React Native SDK. The samples showcase various features and best practices for implementing the SDK in your React Native projects.
+
+## Sample Applications
+
+1. [react-hooks](react-hooks): A stateless application that demonstrates the usage of React hooks with the Branch SDK.
+
+## Pre-requisites
+
+Please refer to the README file of each sample application for specific pre-requisites and setup instructions.
+
+## Getting Started
+
+To get started with a sample application, navigate to its directory and follow the instructions provided in the README file. Each sample application contains detailed information about its purpose, features, and how to set up and run the project.
+
+## Contributing
+
+We welcome contributions to improve and expand the sample applications provided in this repository. If you have any suggestions, bug reports, or feature requests, please feel free to open an issue or submit a pull request.