Added readmes to projects

RGB.NET.Devices.SteelSeries/README.md

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+[RGB.NET](https://github.com/DarthAffe/RGB.NET) Device-Provider-Package for Steel Series-Devices.
+
+## Usage
+This provider follows the default pattern and does not require additional setup.
+
+```csharp
+surface.Load(SteelSeriesDeviceProvider.Instance);
+```
+
+Since the Steel Series SDK does not provide device information only known devices will work.
+You can add detection for additional devices by adding entires for them to the respective static `DeviceDefinitions` on the `SteelSeriesDeviceProvider`.
+
+# Required SDK
+This provider does not require an additional SDK.