add readme

README.md

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+# Meshtastic Map
+
+A map of all Meshtastic nodes heard via MQTT.
+
+## TODO
+
+- show connection lines between nodes and the neighbours they have heard directly
+- ui to view realtime events from specific nodes
+- ui to view text messages log
+- store x days worth of historical logs
+- be able to go back in time and see how the mesh evolved