Enhance documentation following jira-cli best practices (#10)

* Initial plan

* Update README with comprehensive documentation following jira-cli style

Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: alexec <1142830+alexec@users.noreply.github.com>
Co-authored-by: Alex Collins <alexec@users.noreply.github.com>

Author: Copilot

README.md

@@ -1,23 +1,160 @@
 # diff-server
 
-A tiny Go program that shows git diffs in the current directory and all git repositories in subdirectories.
+A lightweight Go web server that displays git diffs from the current directory and all git repositories in subdirectories. It provides a clean, real-time web interface for viewing uncommitted changes across multiple repositories in your workspace.
+
+Like `jq`, it is a single tiny binary without dependencies, making it easy to install and use anywhere.
+
+## Installation
+
+### Supported Platforms
+
+Binaries are available for:
+- **Linux**: 386, amd64, arm64
+- **macOS**: amd64 (Intel), arm64 (Apple Silicon)
+
+### Download and Install
+
+Download the binary for your platform from the [release page](https://github.com/kitproj/diff-server/releases).
+
+#### Linux
+
+**For Linux (amd64):**
+```bash
+sudo curl -fsL -o /usr/local/bin/diff-server https://github.com/kitproj/diff-server/releases/download/v0.0.1/diff-server_v0.0.1_linux_amd64
+sudo chmod +x /usr/local/bin/diff-server
+```
+
+**For Linux (arm64):**
+```bash
+sudo curl -fsL -o /usr/local/bin/diff-server https://github.com/kitproj/diff-server/releases/download/v0.0.1/diff-server_v0.0.1_linux_arm64
+sudo chmod +x /usr/local/bin/diff-server
+```
+
+**For Linux (386):**
+```bash
+sudo curl -fsL -o /usr/local/bin/diff-server https://github.com/kitproj/diff-server/releases/download/v0.0.1/diff-server_v0.0.1_linux_386
+sudo chmod +x /usr/local/bin/diff-server
+```
+
+#### macOS
+
+**For macOS (Apple Silicon/arm64):**
+```bash
+sudo curl -fsL -o /usr/local/bin/diff-server https://github.com/kitproj/diff-server/releases/download/v0.0.1/diff-server_v0.0.1_darwin_arm64
+sudo chmod +x /usr/local/bin/diff-server
+```
+
+**For macOS (Intel/amd64):**
+```bash
+sudo curl -fsL -o /usr/local/bin/diff-server https://github.com/kitproj/diff-server/releases/download/v0.0.1/diff-server_v0.0.1_darwin_amd64
+sudo chmod +x /usr/local/bin/diff-server
+```
+
+#### Verify Installation
+
+After installing, verify the installation works:
+```bash
+diff-server -h
+```
+
+### Build from Source
+
+If you prefer to build from source:
+
+```bash
+git clone https://github.com/kitproj/diff-server.git
+cd diff-server
+go build -o diff-server .
+```
 
 ![Screenshot](screenshot.png)
 
 ## Usage
 
+### Starting the Server
+
+**Run with default settings (port 3844, current directory):**
 ```bash
-# Build
-go build -o diff-server .
+diff-server
+```
+
+**Run on a custom port:**
+```bash
+diff-server -p 9000
+```
+
+**Scan a different directory:**
+```bash
+diff-server -C /path/to/workspace
+```
+
+**Combine options:**
+```bash
+diff-server -p 8080 -C ~/projects
+```
+
+### Viewing Diffs
 
-# Run (default port 3844, current directory)
-./diff-server
+After starting the server, open your web browser and navigate to:
+```
+http://localhost:3844
+```
 
-# Run on custom port
-./diff-server -p 9000
+The web interface will automatically:
+- Display all uncommitted changes in the current directory (if it's a git repository)
+- Recursively scan subdirectories for git repositories
+- Show diffs from all discovered repositories
+- Auto-refresh every 10 seconds to show new changes
 
-# Scan a different directory
-./diff-server -C /path/to/workspace
+### Command-Line Options
+
+```bash
+Usage of diff-server:
+  -C string
+    	Directory to scan for git repositories (default ".")
+  -p string
+    	Port to listen on (default "3844")
 ```
 
-Then open http://localhost:3844 (or your custom port) in a browser to view the diffs.
+## Features
+
+- **Multi-repository support**: Automatically discovers and displays diffs from all git repositories in subdirectories
+- **Real-time updates**: The web interface polls for changes every 10 seconds
+- **Clean UI**: Uses Diff2Html for a beautiful, syntax-highlighted diff view
+- **Untracked files**: Shows new files that haven't been added to git yet
+- **Lightweight**: Single binary with no runtime dependencies
+- **Fast**: Efficient scanning and rendering of diffs
+
+## Use Cases
+
+- **Code review**: Quickly review all changes across multiple projects before committing
+- **Workspace monitoring**: Keep an eye on what's changed in your development workspace
+- **Pair programming**: Share a link to show your current work to teammates
+- **CI/CD**: Run in a pipeline to visualize changes before deployment
+
+## Troubleshooting
+
+### Common Issues
+
+**"Cannot connect" or server not accessible**
+- Verify the server is running: check the terminal for the startup message
+- Ensure the port is not already in use by another application
+- Try a different port: `diff-server -p 8080`
+
+**No diffs showing**
+- Ensure you're in a directory that contains git repositories
+- Check that you have uncommitted changes: `git status`
+- Verify the directory path if using `-C` flag
+
+**Large diffs not fully displayed**
+- The server limits output to 5MB per request to prevent memory issues
+- Consider committing some changes or viewing specific repositories separately
+
+**Permission denied when installing**
+- Use `sudo` when installing to `/usr/local/bin`
+- Alternatively, install to a user-owned directory like `~/bin` and add it to your PATH
+
+### Getting Help
+
+- Report issues: https://github.com/kitproj/diff-server/issues
+- Check existing issues for solutions and workarounds