Add realtime commands to readme

Author: caesay

ObsExpressCpp.sln

@@ -5,6 +5,14 @@ VisualStudioVersion = 17.1.32319.34
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ObsExpressCpp", "ObsExpressCpp.vcxproj", "{AB677678-5476-4E54-AC70-F4237823AF50}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{F200E3F9-0DC0-4B5D-9861-2BEE96FDC80B}"
+	ProjectSection(SolutionItems) = preProject
+		configure-obs.ps1 = configure-obs.ps1
+		LICENSE = LICENSE
+		pack-release.ps1 = pack-release.ps1
+		README.md = README.md
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64

README.md

@@ -28,9 +28,21 @@ The command line help is as follows:
 
 The only required parameters are `captureRegion` and `output`. 
 
-Both the `speakers` and `microphone` parameters can be specified more than once, to record multiple devices. They support `default` being passed in as the value to use the default device, or the `{ID}` of the device as returned from `MMDeviceEnumerator`.
+Both the `speakers` and `microphone` parameters can be specified more than once, to record multiple devices. 
+They support `default` being passed in as the value to use the default device, or the `{ID}` of the device as returned from `MMDeviceEnumerator`.
+Maximum 5 simultaneous audio devices.
+
+### Realtime Commands
+
+While the recorder is running, you can provide the following commands via stdin:
+
+- `q` or `Ctrl+C`: Stop recording and quit.
+- `mute`: Mutes an audio device. Must provide the device type and index (order in which it was provided in command line arguments). 
+  Examples:
+  - Mute the first speaker device: `mute s 0`
+  - Mute the second microphone device: `mute m 1`
+- `unmute`: Unmutes an audio device. Same syntax as `mute`.
 
-Type 'q' and Enter, or 'Ctrl+C' to stop an in-progress recording.
 
 ### Compiling