add custom commands to readme

Author: SoMuchForSubtlety

README.md

@@ -1,14 +1,17 @@
+
+
 ## F1Viewer
 
 Stream any F1TV VOD with MPV or download the corresponding .m3u8 file. 
 
 Now also supports live streams.
 
-![screenshot](https://i.imgur.com/K8yCkib.png)
+![alt text](https://i.imgur.com/K8yCkib.png)
 
+
 ### USAGE
 
- 1. **Install F1Viewer** 
+ 1. **install F1Viewer** 
 
 	build it yourself
 
@@ -21,28 +24,54 @@ Now also supports live streams.
 	    
 	**or**
 
-	download [pre-compiled binaries](https://github.com/SoMuchForSubtlety/F1viewer/releases/)
-
+	or download pre-compiled binaries
+https://github.com/SoMuchForSubtlety/F1viewer/releases/
 
  2. **Download MPV**
 
-	Download it from [here](https://mpv.io/installation/) (Windows users please get the latest version from [here](https://sourceforge.net/projects/mpv-player-windows/files/)) and either put it in the same folder as the  F1Viewer binary or add it to your PATH environment variable.
+	Download it from [here](https://mpv.io/installation/) and either put it in the same folder as the  F1Viewer binary or add it to your PATH environment variable.
+
+
+    
 
 ### FLAGS
 
     -d
 shows debug information
 
-    -vlc
-enables the VLC http stream option, requires a config with the correct parameters set.
-
 ### CONFIG
-The config is optional. It is used to set a preferred audio language and VLC streaming credentials.
+The config is is optional. It is used to set a preferred audio language and custom commands.
 The sample config looks like this.
 
     {
         "preferred_language": "en",
-        "vlc_telnet_port": "4212",
-        "vlc_telnet_pass": "admin"
+        "custom_playback_options": [
+            {
+                "title": "Play with MPV custom",
+                "commands": [
+                    ["mpv", "$url", "--alang=de"]
+                ],
+                "watchphrase": "Video",
+                "command_to_watch": 0
+            }
+        ]
     }
+
 Save it as `config.json` in the same Folder as the F1Viewer binary 
+
+### CUSTOM COMMANDS
+You can execute custom commands, for exaple to launch a different player. These are set in the config under `custom_playback_options`. You can add as many as you want. 
+
+`title` is the title. It will appear next to the standard `Play with MPV` and `Download .m3u8`.
+
+`commands` is where your custom command goes. There can be one or more. 
+Commands are saved as a list of args, like `["mpv", "$url", "--alang=de"]`. 
+`$url` will be replaced with the correct playback URL.
+
+`watchphrase` is optional. it is used to play a `loading...` animation. 
+F1Viewer can parse the output of your command and stop the animation once the `watchphrase` is found. This can be useful if your command takes a while to execute.
+
+`command_to_watch` belongs to `watchphrase`. It defines what command to parse if there are multiple. It is indexed at 0 so if you only have 1 command, `command_to_watch` should be `0`.
+
+If `command_to_watch` is out of range or `watchphrase` is an empty string, the loading animation will be skipped.
+