Add migration guide for 1.17

guide/docs/migration/1_16_to_1_17.md

@@ -0,0 +1,27 @@
+# Updating from KSpigot for 1.16 to KSpigot for 1.17
+
+## Dependency management
+
+Do **not** use the Gradle shadow plugin anymore! Spigot now has its own library feature, use that one instead. This
+applies to KSpigot, but in the best case for your other dependencies as well!
+
+For KSpigot this means, that you have to add the following to your `plugin.yml`:
+
+```yaml
+libraries:
+  - "net.axay:kspigot:VERSION"
+```
+
+Of course, replace `VERSION` with the KSpigot version you are using.
+
+Read the setup guide for more information.
+
+## Removed features
+
+You can no longer await anvil input from a player. This feature was not stable enough to fit in this project.
+
+## Changed
+
+The `Listener.register()` extension function now is no longer available, instead it has been replaced
+by `SingleListener<T : Event>.register()`. Don't worry, this means that this change does not affect you if you are using
+the `listen` function provided by KSpigot.

guide/mkdocs.yml

@@ -40,3 +40,5 @@ nav:
       - Item builder: extensions/itembuilder.md
   - Gui:
       - Compounds: gui/compounds.md
+  - Migration:
+      - "1.16 -> 1.17": migration/1_16_to_1_17.md