Feature - added caching mechanism using redis.

[SarveshAtawane]

Description

• README.md: Updated the setup instructions for better clarity and consistency, including formatting changes and adding the Redis cache setup section.
• config/redis_config.py: Added a new configuration file for setting up Redis cache, including functions to get and set cache data.
• requirements.txt: Added redis package to the requirements.
• routes/NewsRoutes.py: Minor formatting changes.
• services/NewsService.py:
  • Integrated Redis caching to store and retrieve news data.
  • Added a function to generate unique cache keys based on the model and keywords.
• tests/unitTest_redis.py: Added unit tests for Redis caching functionality.

Related Issue

This PR completes #33

How Has This Been Tested?

This is tested manually by comparing response time using postman.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.