docs: replace boilerplate README with project-specific documentation

[Copilot]

The README was the default create-next-app template — useless for anyone trying to understand or run the project.

Changes

• Overview: describes the project as an AI-powered Useme job application pipeline
• Tech stack: table covering Next.js 15, PrimeReact, Prisma/PostgreSQL, OpenAI, Puppeteer
• Setup: env var reference (all variables from .env.example documented), DB migration steps
• Usage: explains each dashboard action (Scrap → Verify → Generate → Send) and the /prompts page
• Project structure: annotated directory tree mapping actions/, services/, components/
• Scripts & schema: quick-ref for npm scripts and Prisma models

[Copilot]

Pull request overview

Replaces the default create-next-app README with project-specific documentation describing “Job Finder” (an AI-assisted Useme job application pipeline), how to configure it, and how to operate the dashboard.

Changes:

• Adds a project overview, feature list, and tech stack summary.
• Documents environment variables and initial setup steps (including Prisma/DB setup).
• Explains dashboard workflow, project structure, scripts, and Prisma models at a high level.

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