added migrated 2.x add-ons

Signed-off-by: Kai Kreuzer <kai@openhab.org>

bundles/org.openhab.binding.onewiregpio/README.md

@@ -0,0 +1,59 @@
+# OneWire GPIO Binding
+
+This binding reads temperature values from OneWire bus sensors connected to the GPIO bus on Raspberry Pi.
+
+
+## Supported Things
+
+Temperature sensors. 
+Tested successfully with DS18B20 sensor on Raspberry Pi 3.
+
+
+## Binding Configuration
+
+The binding requires OneWire sensor to be properly connected to Raspberry Pi GPIO bus,
+"w1_gpio" and "wire" kernel modules should be loaded.
+Configuration is proper when /sys/bus/w1/devices folder is present, and contains sensor's data. 
+
+## Thing Configuration
+
+The sensors are visible in the system as folders containing files with sensor data.
+By default all OneWire GPIO devices are stored in /sys/bus/w1/devices/DEVICE_ID_FOLDER, 
+and the temperature value is available in the file "w1_slave". The Thing needs full path to the w1_slave file.
+Note the values in sysfs are in Celsius.
+
+Optional parameter precision makes it easier to lower precision of the sensor value, i.e. precision 1 makes sensor value to show only one digit after the floating point, precision 2 - shows 2 digits. It makes precision reduction with round up, i.e. 20.534C with precision 1 will be 20.5C, 20.555 with same precision will be 20.6C. Allowed values are from 0 to 3. Default value of parameter is 3(max precision).
+
+In the thing file, this looks e.g. like
+
+```
+Thing onewiregpio:sensor:livingRoom "Living room" [gpio_bus_file="/sys/bus/w1/devices/28-0000061b587b/w1_slave",refresh_time=30,precision=1]
+```
+
+## Channels
+
+The devices supports currently one channel - "temperature" which allows to read temperature from OneWire temperature sensor.
+
+
+## Full Example
+
+sample onewiregpio.things file content:
+
+```
+Thing onewiregpio:sensor:livingroom "Living room" [gpio_bus_file="/sys/bus/w1/devices/28-0000061b587b/w1_slave",refresh_time=30]
+```
+
+sample onewiregpio.items file content (implements QuantityType for unit conversion):
+
+``` 
+Number:Temperature LivingRoomTemperature      "Temperature: [%.2f %unit%]" <temperature>  { channel="onewiregpio:sensor:livingroom:temperature" }
+```
+
+sample demo.sitemap file content:
+
+```
+sitemap demo label="Main Menu"
+{
+    Text item=LivingRoomTemperature
+}
+```