Add rate limiter on all APIs #10

[Targter]

Issue #10 : Add Rate Limiter on All APIs

### Objective:
Implement a rate limiter on all API endpoints to control the number of requests a client can make in a given time frame.

### Details:

Rate Limiting Library:
Utilize the express-rate-limit middleware for implementing rate limiting in the Express application.

Rate Limit Configuration:
Set a limit of 5 requests per second for each client to prevent abuse and ensure fair usage of the API.

Response for Exceeding Limit:
Configure the response behavior when the limit is exceeded:
Send a response with a message indicating the client should "Try again later" to inform users of the rate limit.

### Implementation Steps:

• Install the express-rate-limit package via npm:
• npm install express-rate-limit
• Import the library in your main application file.
• Create a rate limiter middleware using the following configuration:
• app.use(limiter);

Screenshots

In this image, only 5 requests are sent successfully; subsequent requests receive a 429 error indicating 'Too Many Requests

This image shows the received requests in our backend, highlighting that only 5 requests are processed successfully, while subsequent requests result in a 429 error indicating 'Too Many Requests.

Testing:

• Ensure to test the implementation thoroughly by attempting to exceed the request limit and confirming that the appropriate response is received.

Benefits:

Helps maintain API performance by preventing excessive requests from any single user.
Enhances the overall user experience by providing clear feedback when limits are exceeded.

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