Update README: add start.sh, fix Quick Start

- Add start.sh to Quick Start section and project file tree
- Remove broken cp .env.example reference (no such file)
- Annotate .env with config categories

README.md

@@ -64,10 +64,16 @@ PriceStore ─────────┼─────────────
 ```bash
 cd exchange-monitor-go
 go build -o exchange-monitor .
-cp .env.example .env   # edit to configure
+# Edit .env to configure (token, threshold, etc.)
 ./exchange-monitor
 ```
 
+Or use the startup script (auto-compiles if sources changed, cleans stale port):
+
+```bash
+./start.sh
+```
+
 Then open [http://localhost:8888](http://localhost:8888) for the Web dashboard.
 
 ## Configuration (.env)
@@ -174,7 +180,8 @@ exchange-monitor-go/
 ├── dashboard.go              # Web server + SSE + history buffers
 ├── toaster.go                # Telegram notifications
 ├── static.go                 # Embedded web static files
-├── .env                      # Local configuration
+├── start.sh                  # Startup script (port check + build + run)
+├── .env                      # Local configuration (TELEGRAM, API keys, thresholds)
 ├── exchange/
 │   ├── connector.go          # Generic WS connector with reconnect
 │   ├── binance.go            # Binance bookTicker WS