docs: add volume, certificate, and reload docs

README.md

@@ -10,6 +10,9 @@ TUI Mumble client with voice support and push-to-talk.
 - Channel browsing and text chat
 - Chat input history (Up/Down arrow navigation)
 - Self-deafen toggle
+- Volume control (input/output gain)
+- Client certificate authentication
+- Config hot-reload (F5)
 
 ## Key Bindings
 
@@ -17,7 +20,10 @@ TUI Mumble client with voice support and push-to-talk.
 |-----|--------|
 | `Tab` | Cycle focus (chat input / channel tree) |
 | `F1` | Toggle self-deafen |
+| `F2` | Cycle output volume |
+| `F3` | Cycle input volume |
 | `F4` | Push-to-talk (configurable) |
+| `F5` | Reload config from disk |
 | `Enter` | Send message / join channel (sidebar) |
 | `Up` | Previous message (input) / previous channel (sidebar) |
 | `Down` | Next message (input) / next channel (sidebar) |
@@ -44,6 +50,12 @@ mkdir -p ~/.config/tuimble
 host = "mumble.example.com"
 port = 64738
 username = "myname"
+# certfile = "/path/to/cert.pem"
+# keyfile = "/path/to/key.pem"
+
+[audio]
+# output_gain = 1.0
+# input_gain = 1.0
 
 [ptt]
 key = "f4"