Add docker-compose support with environment variable configuration

- Create docker-compose.yml with server and agent services
- Add environment variable support to Dockerfiles via entrypoint scripts
- Configure server with ADDR, PORT, USERNAME, PASSWORD vars
- Configure agent with SERVER, INTERVAL, AGENT_ID vars
- Add health check to server service for container orchestration
- Add service dependencies to ensure server starts before agent
- Create .dockerignore to optimize Docker builds
- Update QUICKSTART.md with Docker Compose instructions
- Support running server only, agent only, or full stack
- Support multiple agents with custom identifiers

QUICKSTART.md

@@ -1,6 +1,45 @@
 # Nerd Monitor - Quick Start Guide
 
-## Building
+## Docker Compose (Easiest)
+
+The easiest way to get started is using Docker Compose:
+
+### Run Full Stack (Server + Agent)
+```bash
+docker-compose up
+```
+
+Access the dashboard at: **http://localhost:8080**
+
+### Run Server Only
+```bash
+docker-compose up server
+```
+
+### Run Agent Only (with external server)
+```bash
+SERVER=your-server:8080 docker-compose up agent
+```
+
+### Run Multiple Agents
+```bash
+# Start the server
+docker-compose up -d server
+
+# Run agents with custom IDs
+docker-compose run --name agent1 -e AGENT_ID=machine1 agent
+docker-compose run --name agent2 -e AGENT_ID=machine2 agent
+```
+
+### Docker Compose Configuration
+Edit `docker-compose.yml` to customize:
+- Server credentials: `USERNAME` and `PASSWORD`
+- Agent reporting interval: `INTERVAL`
+- Agent custom ID: `AGENT_ID`
+
+## Native Binaries
+
+### Building
 
 ```bash
 # Build for current OS
@@ -111,6 +150,8 @@ Change these when starting the server:
 ./bin/nerd-monitor-server -username myuser -password mysecurepass
 ```
 
+Or with Docker Compose, edit the `USERNAME` and `PASSWORD` environment variables in `docker-compose.yml`.
+
 ## Architecture
 
 - **Server**: Web UI, API endpoint for agent stats, in-memory storage
@@ -134,3 +175,8 @@ Change these when starting the server:
 - Verify server is running: `http://localhost:8080`
 - Check firewall rules allow the agent port
 - Ensure correct server address and port are specified
+
+### Docker Compose agents can't reach server
+- Verify server is healthy: `docker ps` (server should show healthy status)
+- Check both containers are on the same network: `docker network inspect nerd-monitor`
+- Ensure `SERVER` environment variable is set to `server:8080` (the service name)