[Open Hive] Add openhive-esp32.ino

The Arduino firmware for the Open Hive ESP32 appliance.

https://community.hiveeyes.org/t/open-hive-esp32-ttgo-t-call-sim800c/4202

Author: ClemensGruber

openhive/openhive-esp32/README.md

@@ -0,0 +1,18 @@
+# Open Hive Bee Monitoring System
+
+
+## About
+
+Open Hive is a bee monitoring system. It consists of different hardware options,
+software, and documentation.
+
+
+## Resources
+
+- Origin: http://open-hive.org/
+- Overview: [Open Hive Arduino Firmwares]
+- This device: [Open Hive ESP32 / TTGO T-Call SIM800C]
+
+
+[Open Hive Arduino Firmwares]: https://hiveeyes.org/docs/arduino/firmware/overview.html#open-hive
+[Open Hive ESP32 / TTGO T-Call SIM800C]: https://community.hiveeyes.org/t/openhive-esp32-ttgo-t-call-sim800c/4202