[FEAT]: Setup agents.md file with relevant skills for the repo

[AshutoshDash1999]

Description

• Added AGENTS.md file to give coding agents project context.
• Installed relevant skills to increase capabilities of coding agents.

Skill	What it does in this repo
conventional-commit	Reads your staged changes and generates a correctly-formatted Conventional Commit message (e.g. feat(frontend): ...) that passes the Husky commitlint hook
mongodb-query-optimizer	Analyzes slow Mongoose/MongoDB queries in backend/, suggests indexes, and explains why a query is slow
nodejs-backend-patterns	Provides patterns for Express 5 routes, middleware, error handling, and auth — applied to code under backend/
wcag-audit-patterns	Audits React components in frontend/ against WCAG 2.2, flags violations, and suggests accessible fixes

Closes #103

Skills are installed from https://skills.sh/