Add readme

Author: rpetti

README.md

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+# vmcli
+
+## Usage
+
+This tool allows you to set different VoiceMeeter properties from the command line:
+
+```
+vmcli <property setting> ...
+```
+
+The properties are described in the API documentation [here](https://download.vb-audio.com/Download_CABLE/VoicemeeterRemoteAPI.pdf).
+
+## Examples
+
+Setting the gain of the first input to 0:
+
+```
+vmcli Strip[0].Gain=0
+```
+
+Increasing the gain by 10:
+
+```
+vmcli Strip[0].Gain+=10
+```
+
+Decreasing the gain by 10:
+
+```
+vmcli Strip[0].Gain-=10
+```
+
+Toggling properties:
+
+```
+vmcli !Strip[0].Mute
+```
+
+Multiple settings can be changed at once:
+
+```
+vmcli Strip[0].Mute=0 Strip[0].Gain=10 Strip[1].Mute=1
+```