Add readme to Eddystone

ruuvi_examples/eddystone/readme.md

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+# Eddystone firmware
+
+ * Uses Nordic's Eddystone implementation to provide Eddystone beacon capablities.
+ * Enter configuration mode by doing NFC scan or pressing button "B"
+ * Default password is (0x)00112233445566778899AABBCCDDEEFF
+ * If you change your password, be sure to remember it. You'll need a wired connection to RuuviTag to reset forgotten password.
+ * Advertises "https://ruuvi.com" at 2 Hz, +0 dBm at boot.  
+ * TLM frames use nRF52 as temperature sensor, regardless of if BME280 is present. 
+
+ # Changelog
+ ## 2.3.0
+ * Removes Ruuvi BLE code, uses fully Nordic code instead
+ * Fixes issue with Eddystone EID ECDH ky exchange
+ * Removes DFU and DIS services from the GATT profile 
+
+