[CHF-523]

Adding Readme files for the following DTH:

1. Z-Wave Switch Generic
a) Leviton 15A Switch VRS15-1LZ (Z-Wave)
b) Enerwave Duplex Receptacle ZW15R (Z-Wave)
c) Enerwave On/Off Switch ZW15S (Z-Wave)

2. Dimmer Switch
a) 1,000-Watt In-Wall Smart Dimmer Switch (GE 12725)
b) In-Wall Smart Fan Control (GE 12730)

3. ZigBee RGB Bulb
a) OSRAM LIGHTIFY Gardenspot mini RGB

4. ZigBee RGBW Bulb
a) OSRAM LIGHTIFY Flex RGBW strips

devicetypes/smartthings/zigbee-rgb-bulb.src/.st-ignore

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+.st-ignore
+README.md

devicetypes/smartthings/zigbee-rgb-bulb.src/README.md

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+# ZigBee RGB Bulb
+
+Cloud Execution
+
+Works with: 
+
+* [OSRAM LIGHTIFY Gardenspot mini RGB](https://www.smartthings.com/works-with-smartthings/lighting-and-switches/osram-lightify-gardenspot-rgb)
+
+## Table of contents
+
+* [Capabilities](#capabilities)
+* [Health](#device-health)
+* [Battery](#battery-specification)
+
+## Capabilities
+
+* **Actuator** - represents that a Device has commands
+* **Color Control** - It represents that the color attributes of a device can be controlled (hue, saturation, color value).
+* **Configuration** - _configure()_ command called when device is installed or device preferences updated.
+* **Polling** - It represents that a device can be polled.
+* **Refresh** - _refresh()_ command for status updates
+* **Switch** - can detect state (possible values: on/off)
+* **Switch Level** - represents current light level, usually 0-100 in percent
+* **Health Check** - indicates ability to get device health notifications
+* **Light** - Indicates that the device belongs to light category.
+
+## Device Health
+
+Zigbee RGB Bulb with reporting interval of 5 mins.
+SmartThings platform will ping the device after `checkInterval` seconds of inactivity in last attempt to reach the device before marking it `OFFLINE` 
+
+*__12min__ checkInterval
+
+## Troubleshooting
+
+If the device doesn't pair when trying from the SmartThings mobile app, it is possible that the device is out of range.
+Pairing needs to be tried again by placing the device closer to the hub.
+Other troubleshooting tips are listed as follows:
+* [OSRAM LIGHTIFY Gardenspot mini RGB Troubleshooting](https://support.smartthings.com/hc/en-us/articles/214191863)