Create ReadMe.md

ReadMe.md

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+# CamParam
+
+I was shocked to find no simple way to change basic webcam settings (gain, exposure, etc.) from the command line on Windows. After much time spent looking at existing approaches, I finally gave in and wrote this little program.
+
+An earlier C# version of this program is [CamParamSharp](https://github.com/scottgarner/CamParamSharp).
+
+## Usage
+
+```
+// List available devices.
+
+CamParam.exe              
+
+// Output
+
+0 HD Pro Webcam C920     
+1 OBS Virtual Camera
+```
+
+```
+// List properties for a device.
+
+CamParam.exe device 0
+
+// Output
+
+Pan 0
+Tilt 0
+Roll 0
+Zoom 100
+Exposure -5
+Iris -5
+Focus 15
+Brightness 128
+Contrast 128
+Hue 128
+Saturation 128
+Sharpness 128
+Gamma 128
+ColorEnable 128
+WhiteBalance 4200
+BacklightCompensation 0
+Gain 64
+```
+
+```
+// Set exposure and gain for device "0".
+
+CamParam.exe device 0 gain 64 exposure -5  
+
+// Output
+
+Exposure -5
+Gain 64
+```
+
+## Acknowledgements
+
+The basis of this program is heavily influenced by [CommandCam](https://github.com/tedburke/CommandCam/blob/master/Makefile).