add sensor as non-library sketch

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+# Mussel Sensor Beacon
+
+1. Reads sensors.
+
+2. Normalises sensor data as a gape angle in the range of 0°-90°.
+
+3. Broadcasts normalised sensor data as a beacon on a bluetooth network.
+
+## Scanner apps
+
+These Android apps have been found usable
+for monitoring this type of sensor:
+
+  * FeasyBeacon on Play store
+  * NanoBeacon BLE Scanner on Play store
+    * decodes Eddystone TLM temperature as Fahrenheit
+    * does not decode Eddystone URL
+  * SemBeacon on Play store
+    * detects URL-only but not TLM-only Eddystone Beacon
+    * too aggressive caching misses changing data
+    * UI optimized for SemBeacon
+  * nRF Connect for Mobile on Play store
+    * misses changing data
+    * UI not specific to beacons
+
+These Android apps are potentially interesting as well:
+
+  * Beacon Locator on F-droid
+    * unreliable detection
+    * active development
+  * BLE Radar on F-droid
+    * detects URL-only but not TLM-only Eddystone Beacon
+    * UI not specific to beacons
+  * AltBeacon Loc on Play store
+    * detects URL-only but not TLM-only Eddystone Beacon