Add mnemonic mute controls

README.md

@@ -226,6 +226,7 @@ When in the treeview, pressing:
 * left or right arrow on a channel changes the volume for all users in that channel
 * left or right arrow on a user changes the volume for that user.
 * backspace restores the focused user, or every user in the focused channel, to unmuted, 100% volume, and normal boost.
+* m locally mutes or unmutes the focused user or channel. On your own user, it changes your Mumble self-mute state instead.
 * enter on de-selected user selects that user for PM mode.
 * enter on selected user de-selects the user
 * enter on a channel de-selects any selected users (if any) and moves you to the specified channel.
@@ -300,7 +301,8 @@ After running the command above, `barnard` will be compiled as `$(go env GOPATH)
 
 ### Key bindings
 
-- <kbd>F1</kbd>: toggle voice transmission
+- <kbd>Ctrl+T</kbd>: toggle voice transmission
+- <kbd>Alt+M</kbd>: toggle your Mumble self-mute state from anywhere
 - <kbd>F9</kbd>: toggle noise suppression
 - <kbd>F12</kbd>: toggle automatic gain control
 - <kbd>F10</kbd>: open actions menu for the focused tree item
@@ -313,7 +315,7 @@ After running the command above, `barnard` will be compiled as `$(go env GOPATH)
 - <kbd>End</kbd>: scroll chat to the bottom
 - <kbd>Ctrl+Q</kbd>: quit
 
-With the user/channel tree focused, Left/Right changes incoming volume and Backspace restores the focused user or channel to unmuted, 100% volume, and normal boost. In the message input, those keys retain their normal text-editing behavior.
+With the user/channel tree focused, M locally mutes the focused user or channel, Left/Right changes incoming volume, and Backspace restores the focused user or channel to unmuted, 100% volume, and normal boost. M on your own user toggles self-mute. In the message input, printable letters and editing keys retain their normal behavior.
 
 ## License