Add project README with build instructions

README.md

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+# Heltec V3 MeshCore Repeater
+
+A standalone MeshCore LoRa mesh repeater for the Heltec WiFi LoRa 32 V3.
+
+## Build
+
+```bash
+pio run
+```
+
+## Flash
+
+**Via USB:**
+```bash
+pio run -t upload
+```
+
+**Via OTA:**
+1. Connect to serial: `screen /dev/ttyUSB0 115200`
+2. Type: `start ota`
+3. Join WiFi: `MeshCore-OTA`
+4. Browse to: `http://192.168.4.1/update`
+5. Upload: `.pio/build/heltec_v3_repeater/firmware.bin`
+
+## Monitor
+
+```bash
+pio device monitor
+```
+
+## Configuration
+
+Edit `platformio.ini`:
+
+```ini
+-D ADVERT_NAME='"RPM Repeater"'
+-D ADVERT_LAT=0.0
+-D ADVERT_LON=0.0
+-D ADMIN_PASSWORD='"password"'
+```
+
+## Dependencies
+
+Requires MeshCore library at `../MeshCore`.
+
+## Docs
+
+See [docs/](docs/) for detailed documentation.