Implement observer pattern in react native

[Anjitha-94]

@Suhail0206327 Your code is neat and clean, it is better if you had more comments for the code for a better understanding

[ash-teach]

I think you've made some unintentional commits, but it is very difficult to say without there being any actual documentation in your submission.

Please review and provide appropriate documentation (README.md, or comments, or both) so that your code and intention can be well-understood.

[suhail3728]

I have updated the readme file for better understanding of this repository

[ash-teach]

I won't merge this because there are still too many errors in the PR: There are excess files, and some files that should not have been touched were edited. The work will remain, so there is a record of it, but it can't be merged as-is.