Update README.md

README.md

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 # Exec
 
-Makes possible to run external scripts via commands.
+Exec is a Minecraft server plugin that makes possible to run external scripts via commands. The scripts can be written with Bash or Python for example and the code changes don't need a server restart.
+
+[PlaceholderAPI](https://www.spigotmc.org/resources/placeholderapi.6245/) is required. You might also want to use [mcrcon](https://github.com/Tiiffi/mcrcon) for script output.
+
+## Config
+    commands:
+        examplecommand:
+            script: "/path/to/your/script %player_name% %args%"
+            permission: "exec.example"
+
+The Exec config looks like this. You can use the following placeholders:
+* %args% means all arguments provided to the command.
+* %arg_1%, "arg_2" can be used to read arguments too.
+* PlaceholderAPI is supported (and usually required). %player_name% is the most useful one.
+
+You can use `/exec reload` to reload the config.