Add documentation hint

Signed-off-by: Knut Ahlers <knut@ahlers.me>

README.md

@@ -9,3 +9,18 @@
 Twitch-Bot is intended as an alternative to having a bot managed by Streamlabs or Streamelements and therefore having more control over it, the availability and how it works.
 
 At the moment it is a work-in-progress and does not yet implment all features it shall in the future.
+
+## Configuration
+
+Please see the [Wiki](https://github.com/Luzifer/twitch-bot/wiki) for documentation of the configuration file.
+
+```console
+# twitch-bot --help
+Usage of twitch-bot:
+  -c, --config string          Location of configuration file (default "./config.yaml")
+      --log-level string       Log level (debug, info, warn, error, fatal) (default "info")
+      --storage-file string    Where to store the data (default "./storage.json.gz")
+      --twitch-client string   Client ID to act as
+      --twitch-token string    OAuth token valid for client
+      --version                Prints current version and exits
+```