add README.me for the TBeam code

Author: tschudin

esp32/loramesh-TBeam/README.md

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+# tinySSB code for ESP32 T-Beam 1.1 and Heltec Lora V1.2 devices
+
+This is the LoRa mesh network code for tinySSB.
+
+How it works: A collection of T-Beam and Heltec devices form a
+wireless 'virtual pub' where all new tinySSB content injected at one
+node will be available at all other nodes of the mesh. External
+devices interface with the mesh via Bluetooth Low Energy.  Typically
+you need the tinySSB Android app in order to access the mesh.
+
+- nodes talk to each other via LoRa (1 to 10 miles)
+- support for different LoRa profiles (AU915, EU868 and US915)
+- nodes talk to non-mesh nodes via Bluetooth Low Energy (30 to 300 feet)
+- local management commands via serial-over-USB
+- remote management functionality
+- logging of LoRa reception
+- WiFi and KISS-over-USB are local access options but are disabled by default
+
+
+---