Added .env.example file & fixed readme VITE_API_URL path

[RaunaK-cap]

Description

• Added .env.example file on both frontend and backend file
• fixed VITE_API_URL path that was mentioned in Readme file

Fixes #157

Motivation and Context:

• Getting error while setting up locally

Types of Changes

• [ x ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ x] Enhancement (improvement to an existing feature)
• [ x ] Breaking change (fix or feature that would cause existing functionality to change)
• Test (adds or updates tests only)
• [ x ] Documentation (non-code change)

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[archa8]

LGTM!