Improve Readme

[neeldoshii]

Improvements

Currently the readme contains just CHATGPT contents just about some features of the app. I would like to have full revamp.

I like the proper documented like this references to
https://github.com/Automattic/pocket-casts-android
https://github.com/Ivy-Apps/ivy-wallet

Content Flow:

1. One-two line description about the app.
   Install link (currently the app is not on play store so will provide release build ATM. We are soon goanna launch it to play store so will add play store link later on
2. Need of this app.
3. Directory Structure Explanation
   Reference
   
4. Whenever someone raises a PR what guidelines should be done ---
   Need similar to this
   https://github.com/Automattic/pocket-casts-android/blob/main/docs/pull-request-guidelines.md
   https://github.com/Automattic/pocket-casts-android/blob/main/.github/pull_request_template.md
5. Tech Stack Used
6. Contributors Name and Photo

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Would love to hear more things which we can add on so we can provide smooth onboarding to new contributors.