add more documentation

Author: ftl

README.md

@@ -2,6 +2,37 @@
 
 An OpenAction ([OpenDeck](https://github.com/nekename/OpenDeck)) plugin to control ham radio transceivers through a hamlib rigctld daemon.
 
+## Configuration
+
+The plugin currently supports only one rigctld connection to `localhost:4532`.
+
+## Actions
+
+The following actions are currently available:
+
+| Action | rigctld Command | Description |
+|--------|----------------|-------------|
+| Frequency Dial | `\set_freq`, `\get_freq` | Encoder to tune the VFO frequency in configurable steps |
+| Level Encoder | `\set_level`, `\get_level` | Encoder to adjust a level value in configurable steps |
+| On/Off | `\get_powerstat`, `\set_powerstat` | Toggle the rig power between on and off |
+| Power State | `\set_powerstat` | Set the rig to a specific power state (off, on, standby, operate) |
+| RIT | `\set_rit`, `\get_rit`, `\set_func` | Encoder to adjust the RIT offset, press/keypad to toggle RIT on/off |
+| Select Mode | `\set_mode` | Set the operating mode for a VFO |
+| Select VFO | `\set_vfo` | Select the active VFO |
+| Send Morse | `\send_morse` | Send a preconfigured text as Morse code |
+| Set Antenna | `\set_ant` | Select an antenna for a VFO |
+| Set Frequency | `\set_freq` | Set the frequency of a VFO to a fixed value |
+| Set Frequency (rel) | `\set_freq`, `\get_freq` | Set a VFO frequency relative to another VFO's frequency |
+| Set Function | `\set_func` | Enable or disable a rig function |
+| Set Level | `\set_level` | Set a level to a fixed value |
+| Set Parameter | `\set_parm` | Set a rig-wide parameter value |
+| Set Split VFO | `\set_split_vfo` | Enable or disable split operation and set the TX VFO |
+| Stop Morse | `\stop_morse` | Stop the current Morse code transmission |
+| Toggle Function | `\get_func`, `\set_func` | Toggle a rig function on/off |
+| VFO Operation | `\vfo_op` | Perform a VFO operation (e.g. copy, exchange, band up/down) |
+| VFO Operation Encoder | `\vfo_op` | Encoder with configurable VFO operations for clockwise, counter-clockwise, and press |
+| XIT | `\set_xit`, `\get_xit`, `\set_func` | Encoder to adjust the XIT offset, press/keypad to toggle XIT on/off |
+
 ## License
 This software is published under the [MIT License](https://www.tldrlegal.com/l/mit).