Added readmes to projects

RGB.NET.Devices.OpenRGB/README.md

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+[RGB.NET](https://github.com/DarthAffe/RGB.NET) Device-Provider-Package for E1.31 DMX-Devices.
+
+## Usage
+This provider does not load anything by default and requires additional configuration to work.
+
+```csharp
+// Add as many OpenRGB-instances as you like
+OpenRGBDeviceProvider.Instance.AddDeviceDefinition(new OpenRGBServerDefinition());
+
+surface.Attach(OpenRGBDeviceProvider.Instance.Devices);
+```
+
+You can also configure additional things like IP and Port in the ServerDefinition.
+
+# Required SDK
+This provider does not require an additional SDK.