Add professional README

Author: Procura AI Dev

README.md

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+<p align="center">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://img.shields.io/badge/license-AGPLv3-blue?style=flat-square">
+    <img alt="OpenProcure" src="https://img.shields.io/badge/license-AGPLv3-blue?style=flat-square" height="28">
+  </picture>
+  &nbsp;
+  <img src="https://img.shields.io/github/stars/kanojiautkarsh-programmer/openprocure?style=flat-square" alt="GitHub stars" height="28">
+  &nbsp;
+  <img src="https://img.shields.io/badge/types-TypeScript-3178C6?style=flat-square" alt="TypeScript" height="28">
+  &nbsp;
+  <img src="https://img.shields.io/badge/stack-NestJS%20%7C%20Next.js%20%7C%20PostgreSQL-1B4D3E?style=flat-square" alt="Stack" height="28">
+</p>
+
+<h1 align="center">OpenProcure</h1>
+<p align="center"><strong>The open source AI-powered procurement operating system</strong></p>
+
+<p align="center">
+  Control every dollar your company spends with AI-driven spend intelligence,<br>
+  automated vendor management, and multi-provider AI assistant capabilities.
+</p>
+
+---
+
+## Features
+
+- **AI Assistant** — Multi-provider LLM support (OpenAI, Anthropic, NVIDIA) with automatic cascading, circuit breaker fallback, RAG over your documents, and semantic caching
+- **Spend Intelligence** — Automated invoice processing, subscription tracking, contract lifecycle management, and spend analytics
+- **Vendor Management** — Centralized vendor directory, risk scoring, performance tracking, and automated renewals
+- **Approval Workflows** — Multi-level approval chains with escalation rules and compliance tracking
+- **Integrations** — Slack, Microsoft Teams, Gmail, QuickBooks, Xero with bi-directional sync
+- **Forecasting & Analytics** — AI-powered spend forecasting, budget tracking, scenario simulation, and anomaly detection
+- **BYOK (Bring Your Own Key)** — Connect your own AI provider keys per tenant with encryption at rest
+- **Enterprise Ready** — RBAC, audit logging, rate limiting, telemetry, metrics, and health checks built in
+
+## Quick Start
+
+```bash
+# Clone and install
+git clone https://github.com/kanojiautkarsh-programmer/openprocure.git
+cd openprocure
+npm install
+
+# Start dependencies (Docker required)
+docker compose up -d
+
+# Copy environment and fill in your keys
+cp .env.example .env
+
+# Generate Prisma client
+npm run db:generate
+
+# Start development
+npm run dev
+```
+
+### One-command install (Windows)
+
+```powershell
+.\install.ps1
+```
+
+## Architecture
+
+```
+openprocure/
+├── apps/
+│   ├── api/          # NestJS backend (REST API + Webhooks)
+│   └── web/          # Next.js frontend (App Router + Cloudflare)
+├── packages/
+│   ├── ui/           # Shared UI components (Radix + Tailwind)
+│   ├── database/     # Prisma schema + PostgreSQL client
+│   ├── shared/       # Zod schemas + shared TypeScript types
+│   └── config/       # ESLint + TypeScript shared configs
+└── scripts/          # Dev tooling and test setup
+```
+
+### Tech Stack
+
+| Layer | Technology |
+|---|---|
+| Backend | NestJS 11, TypeScript, Prisma 6, PostgreSQL + pgvector |
+| Frontend | Next.js 15, React 19, Tailwind CSS 4, Framer Motion |
+| Auth | Clerk (OAuth, SSO, JWT) |
+| AI | OpenAI, Anthropic Claude, NVIDIA — multi-tenant BYOK |
+| Queue | BullMQ (Redis) |
+| Vector DB | pgvector for RAG embeddings |
+| Testing | Jest, Vitest, Supertest, k6 |
+| Deploy | Render, Cloudflare Pages, Docker |
+
+## AI Assistant Pipeline
+
+```
+User Query → Sanitize → Rate Limit → Token Budget → Classify
+  → Embed → Semantic Cache (hit? return) → RAG Retrieval
+  → Compress → LLM (cascading: OpenAI → Anthropic → NVIDIA)
+  → Guardrails → Response
+```
+
+Each stage is instrumented with OpenTelemetry spans and Prometheus metrics.
+
+## Contributing
+
+OpenProcure is AGPLv3 licensed and open for contributions. See [CONTRIBUTING.md](./CONTRIBUTING.md) and [CLA.md](./CLA.md) for details.
+
+## License
+
+AGPL-3.0-only — see [LICENSE](./LICENSE). Commercial licenses available for enterprise deployments that require proprietary integration.