BUG: Eslint, type errors and documentation update

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Issue Description ✍️

## 📌 Describe the Bug
There are few bugs in client folder:
- Eslint Errors: causing failure in vercel deployment
- Typescript errors
- Client Readme documentation is not updated
- incomplete env variables mentioned in main readme for client directory

## 📷 Screenshot
1. Eslint Errors:


2. Type Errors:


3. Client's Old Readme:


4. Env variable required in client:


.env variables mentioned in main Readme.md file:


## 💡 Suggestions

Please assign me this issue

### Record

- [x] I have synced all my node versions as mentioned in the project
- [x] I am using the same version of npm as is the project
- [x] My current branch is in sync with the development branch
- [x] I want to work on this issue