Write README with project summary and planned features

README.md

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+# Bedside Clock
+
+Networked bedside clock utilising an ESP32-SOLO-1.
+
+## Planned Features
+
+- [ ] Audio alarms
+- [ ] 7 segment display
+- [ ] WiFi networking
+- [ ] Console for configuration
+- [ ] TCP API for configuration
+- [ ] SNTP synchronisation
+
+## Firmware
+
+The firmware is a standard ESP-IDF v5.0 project; refer to [Espressif's
+ESP-IDF
+docs](https://docs.espressif.com/projects/esp-idf/en/release-v5.0/esp32/index.html).