Merge pull request #126 from ojousima/v1-backports

Add readmes to example apps

ruuvi_examples/eddystone/readme.md

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+# Eddystone
+ * Advertises "https://ruuvi.com" at 2 Hz, +0 dBm by default.
+ * Enter configuration mode by pressing "B" or connecting NFC
+ * Default password 00112233445566778899AABBCCDDEEFF
+    - *Important* If you change password and forget it, there is no way to recover the tag without a dev shield.
+ * You can configure the beacon with Nordic's "nRF Beacon for Eddystone" app.
+ * GATT profile has Device Information Service and DFU service (experimental)
+ * _Important_ TLM-frames are not compatible with Google Beacon Tools for unknown reason. 
+ * ID and MAC address of data are readable via NFC
+![screenshot 25 2 2018 11 58 57 ap](https://user-images.githubusercontent.com/2360368/36638828-6e86666c-1a39-11e8-9802-16a0142838ce.png)
+ * Consumes approximately 24 uA at boot, which theoretically gives 4 years of battery life at room temperature.
+ * Enter bootloader by holding "B" down while resetting, assuming you're running the "Full" hex which contains softdevice + bootloader + application.

ruuvi_examples/ruuvi_firmware/readme.md

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+# Ruuvi firmware
+ * Used to be weather station, renamed to Ruuvi Firmware.
+ * Boots up in RAW mode, i.e. data is sent in [Manufacturer specific format, Ruuvi V3](https://github.com/ruuvi/ruuvi-sensor-protocols).
+ * Mode can be changed by pressing button "B"
+ * Uses 16x IIR on BME280, which reduces noise at the expense of slowed response time. Practically the response is limited by enclosure, so
+   slowdown is noticeabble only if the enclosure is open. 
+ * Does not send data before sensors are read at least once to avoid invalid data transmissions.
+ * ID and MAC address of data are readable via NFC
+![screenshot 25 2 2018 11 58 57 ap](https://user-images.githubusercontent.com/2360368/36638828-6e86666c-1a39-11e8-9802-16a0142838ce.png)
+ * 1 Hz +4 dBm transmission on RAW mode
+ * 2 Hz +4 dBm transmission on URL mode. URL mode points to https://ruu.vi/#
+ * Consumes approximately 22 uA in RAW mode, 40 uA in URL mode:
+<img width="1023" alt="nayttokuva 2018-4-19 kello 20 40 54" src="https://user-images.githubusercontent.com/2360368/39012042-8db02510-4413-11e8-8eea-1ba204137d30.png">
+ * Theoretical lifetime is approximately 4 years in RAW mode and 2 years in URL mode. 
+ * Enter bootloader by holding "B" down while resetting, assuming you're running the "Full" hex which contains softdevice + bootloader + application.