docs: Add README.md with project overview, installation, and usage instructions

README.md

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+# Link Checker
+
+A recursive link checker that crawls websites to find broken links and redirects. It helps maintain website health by identifying:
+
+- Broken links (HTTP 4xx, 5xx status codes)
+- Network/DNS errors
+- HTTP redirects (3xx status codes)
+
+## Features
+
+- Recursive crawling of websites
+- Handles both absolute and relative URLs
+- Detects and reports HTTP redirects
+- Shows progress during scanning
+- Normalizes URLs for consistent checking
+- Stays within the same domain
+- Detailed reporting of issues found
+
+## Installation
+
+1. Make sure you have Go installed (version 1.16 or later)
+2. Clone this repository:
+```bash
+git clone <repository-url>
+cd link-checker
+```
+
+3. Install dependencies:
+```bash
+go mod download
+```
+
+## Usage
+
+Run the link checker by providing a starting URL:
+
+```bash
+go run . -url="https://example.com"
+```
+
+The tool will:
+1. Crawl all pages on the same domain
+2. Check all links found (both internal and external)
+3. Display progress during the scan
+4. Generate a report showing:
+   - Total pages checked
+   - List of redirected links
+   - List of broken links
+   - Summary statistics
+
+## Example Output
+
+```
+Checking page 1: https://example.com
+Checking page 2: https://example.com/about
+...
+
+Total pages checked: 15
+
+Redirects found:
+- http://example.com/old-page (Redirect 301 -> https://example.com/new-page)
+- http://example.com/blog (Redirect 302 -> https://blog.example.com)
+
+Broken links found:
+- https://example.com/missing-page (Status: 404)
+- https://example.com/server-error (Status: 500)
+- https://external-site.com/broken (Error: connection refused)
+
+Total issues: 5 (2 redirects, 3 broken)
+```