Add badges, CONTRIBUTING.md, improve README discoverability

Author: JeremiahM37

CONTRIBUTING.md

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+# Contributing to Librarr
+
+Thanks for your interest in contributing! Here's how to get started.
+
+## Quick Start
+
+```bash
+git clone https://github.com/JeremiahM37/librarr.git
+cd librarr
+go build -o librarr ./cmd/librarr/
+go test ./...
+```
+
+## Good First Issues
+
+Check the [good first issue](https://github.com/JeremiahM37/librarr/labels/good%20first%20issue) label for beginner-friendly tasks.
+
+## How to Contribute
+
+1. Fork the repo
+2. Create a branch (`git checkout -b feature/my-feature`)
+3. Make your changes
+4. Run tests (`go test ./...`)
+5. Commit and push
+6. Open a Pull Request
+
+## Code Style
+
+- Standard Go formatting (`gofmt`)
+- Table-driven tests with `t.Run()`
+- Mock HTTP calls with `httptest.NewServer`
+- No external test frameworks — just `testing`
+
+## Adding a Search Source
+
+1. Create `internal/search/yoursource.go` implementing the `Source` interface
+2. Add it to the source registry in `internal/search/searcher.go`
+3. Add config vars in `internal/config/config.go`
+4. Write tests in `internal/search/yoursource_test.go`
+
+## Areas That Need Help
+
+- **Security audit** — review HTTP clients for SSRF/injection (#4)
+- **New search sources** — more book/audiobook/manga sources
+- **UI improvements** — the web UI is functional but minimal
+- **Documentation** — guides for specific setups (Readarr integration, Calibre-Web, etc.)
+
+## License
+
+By contributing, you agree that your contributions will be licensed under GPL-3.0.

README.md

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 # Librarr
 
+[![Build & Test](https://github.com/JeremiahM37/librarr/actions/workflows/test.yml/badge.svg)](https://github.com/JeremiahM37/librarr/actions/workflows/test.yml)
+[![Release](https://img.shields.io/github/v/release/JeremiahM37/librarr?include_prereleases)](https://github.com/JeremiahM37/librarr/releases)
+[![Go Report Card](https://goreportcard.com/badge/github.com/JeremiahM37/librarr)](https://goreportcard.com/report/github.com/JeremiahM37/librarr)
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+
 **The missing *arr for books.** Self-hosted book, audiobook, and manga search and download manager — like Sonarr/Radarr but for your reading library.
 
 Librarr searches 13 sources simultaneously, scores results by confidence, and auto-imports into your Calibre, Audiobookshelf, Kavita, or Komga library. Single 17MB Go binary. No runtime dependencies.