new file: README.md

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software/README.md

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+# Controller Software for DC Sensor
+
+## API definition
+
+- id
+    - GET: Returns a new ID for device to use for future communication.
+- metrics
+    - GET: Prometheus metrics endpoint for temperatures.
+- report
+    - POST: Device reports temperature back on this endpoint.
+
+## UI
+- manage