Improve Documentation on Contributing Process

[screwtape151]

Documentation Improvement

Description

The current README provides a good overview of the steps to contribute to the NativeBase Docs, but it could benefit from more detailed information regarding the development environment setup and testing process.

Suggested Improvements

1. Environment Setup: Add information on prerequisites needed for the setup (Node.js version, package manager, etc.).
2. Testing Changes: Include a section that explains how to run tests, what types of tests are available (if any), and how to interpret the results after running yarn build and yarn start.
3. Common Issues: A subsection addressing common pitfalls encountered during setup or contribution would help new contributors troubleshoot effectively.

By improving these areas, we can ensure that new contributors have a smoother onboarding experience!