Docs(Commands): Documented the command system

docs/CommandLine.md

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+# Command Line
+Trinitrix has a command line, which you can use to control and navigate the app.
+You can activate it with the `CommandLineShow` command, which is mapped to `<Ctrl>+c` by default.
+
+## Syntax (LUA)
+The command line uses [lua](https://www.lua.org/about.html) and provides a builtin function for every internal command.
+The function names are the snake case variants of the command names.

docs/Commands.md

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+# Commands
+Trinitrix relies heavily on the concept of commands.
+There is a command for every interaction with the application.
+By this, everything can use the same internal API, what makes the whole application extreme extensible and customizable.
+
+## Available Commands
+
+| Command         | Description                                                                   |
+|-----------------|-------------------------------------------------------------------------------|
+| Exit            | Terminates the whole application.                                             |
+| CommandLineShow | Shows the command line.                                                       |
+| CommandLineHide | Hides the command line.                                                       |
+| RoomMessageSend | Sends the message, which is passed as argument, to the currently active room. |

docs/Config.md

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+# Config
+To configure trinitrix, you can add a file named `config.lua` to the userdata path.
+This file will be interpreted on startup with the same syntax as the Command Line.