Added mock products API with manual testing support via browser

[anuskagithub]

This pull request introduces a mock products API to the project. The key features include:

1. simple /products endpoint that returns mock product data in JSON format
2. Enabled manual testing via browser by allowing GET requests to visualize the mock data easily
3. Useful for testing and demo purposes before integrating real data or services

Purpose
The goal is to provide a base mock API to help developers test frontend or integration flows without needing a full backend setup.

[pratik-mahalle]

Hey @anuskagithub, Congratulations on raising your first pull request. Unfortunately, this PR doesn’t include any meaningful changes. In this repository, you can come up with the new uses case for the keploy integration with python application. In the future, please ensure that a PR in this repo is raised only if you’ve made substantial updates or solved a particular issue. This helps keep the process efficient and organized.
This being a part of an assignment in api fellowship would be counted since you were suppsoed to create a pr but wont be merged since this is not that relevant of a change. I’m sure you understand, and I appreciate your cooperation on this. We will be closing this PR for now.