Add .gitignore and initial CLAUDE.md documentation

.gitignore

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+backend/
+frontend/

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+This is a GitLab Docker Images Tracker project designed to monitor, track, and manage Docker images across multiple GitLab repositories with automated vulnerability scanning and lifecycle management.
+
+## Project Purpose
+
+This tool addresses the challenge of managing Docker images across numerous GitLab projects by:
+
+1. **Discovery & Tracking**: Automatically discovers Docker images referenced in:
+   - `docker-compose*.yml` files
+   - `Dockerfile*` files  
+   - `.gitlab-ci*.yml` files
+   - Across main branches (main, master, develop)
+
+2. **Lifecycle Management**: Tracks image usage over time to identify:
+   - Images currently in use across projects
+   - Images that have been removed from files, branches, or projects
+   - Images that are no longer referenced anywhere
+
+3. **Vulnerability Scanning**: Provides periodic vulnerability scanning (configurable intervals) with severity classification:
+   - Critical vulnerabilities
+   - High severity vulnerabilities
+   - Medium severity vulnerabilities
+   - Low severity vulnerabilities
+   - Unspecified severity vulnerabilities
+
+4. **Ignore Management**: Offers granular control to exclude from scanning:
+   - Specific Docker images
+   - Entire files (ignoring all images within)
+   - Entire projects (ignoring all files and images within)
+
+5. **Reporting**: Generates actionable reports showing which images need updates and where they are being used across the GitLab infrastructure.
+
+## Core Features
+
+### Image Discovery
+- Scan GitLab repositories for Docker images in configuration files
+- Parse `docker-compose*.yml`, `Dockerfile*`, and `.gitlab-ci*.yml` files
+- Track images across main branches (main, master, develop)
+- Maintain historical data on image usage patterns
+
+### Vulnerability Management
+- Periodic vulnerability scanning (configurable schedule)
+- Severity classification and reporting
+- Integration with vulnerability databases
+- Automated alerting for critical vulnerabilities
+
+### Ignore System
+- **Image-level ignoring**: Exclude specific Docker images from scanning
+- **File-level ignoring**: Exclude entire files from image discovery
+- **Project-level ignoring**: Exclude entire projects from scanning
+- Maintain ignore lists with reasoning and timestamps
+
+### Reporting & Analytics
+- Current image inventory across all projects
+- Vulnerability status dashboard
+- Image lifecycle tracking (active, deprecated, removed)
+- Project-specific image usage reports
+
+## Project Structure
+
+This is a full-stack application with separated backend and frontend:
+
+```
+├── backend/          # Python backend with FastAPI
+│   ├── main.py       # FastAPI application entry point
+│   ├── pyproject.toml # Python dependencies and configuration
+│   └── README.md     # Backend documentation
+└── frontend/         # React + TypeScript frontend
+    ├── src/          # React components and application code
+    ├── package.json  # Node.js dependencies and scripts
+    └── vite.config.ts # Vite build configuration
+```
+
+## Technology Stack
+
+- **Backend**: Python 3.12+ with FastAPI, SQLite database, and python-gitlab
+- **Frontend**: React 19 + TypeScript + Vite + React Router + Tailwind CSS + shadcn/ui
+- **Database**: SQLite for local storage of image inventory, scan results, and configuration
+- **Build Tools**: Vite for frontend, Python packaging for backend
+- **Package Management**: uv/pip for Python, Bun for Node.js
+
+## Commands
+
+### Backend Commands
+```bash
+cd backend
+# Install dependencies
+uv sync
+# Run tests
+uv run pytest
+# Format code
+uv run black .
+# Lint code
+uv run ruff check .
+# Run development server (runs on port 5000)
+uv run python main.py
+```
+
+### Frontend Commands
+```bash
+cd frontend
+# Install dependencies
+bun install
+# Start development server (runs on port 3000)
+bun dev
+# Build for production
+bun build
+# Lint code
+bun lint
+# Preview production build
+bun preview
+```
+
+## Architecture Considerations
+
+- **Data Models**: Projects, Files, Images, Vulnerabilities, Ignore Rules (SQLite schema)
+- **API Layer**: FastAPI REST endpoints for frontend communication
+- **Scanning Engine**: Background job system for repository scanning
+- **GitLab Integration**: python-gitlab library for repository and branch access
+- **Database**: SQLite with proper indexing for performance
+- **Security**: Secure handling of GitLab tokens and vulnerability data
+- **Scalability**: Design for scanning hundreds of repositories efficiently