docs: restructure README into Usage and For mod development sections

README.md

@@ -4,7 +4,21 @@ Server-side mod for Vintage Story. Lets other mods hook into chat commands
 before and after they run, namespaced per mod so multiple mods can watch
 the same command without colliding.
 
-## How it works
+## Usage
+
+Install it like any other mod. It has no effect unless something else
+depends on it.
+
+## For mod development
+
+Add it as a dependency in your `modinfo.json`:
+
+```json
+"dependencies": {
+    "game": "1.22.3",
+    "commandhook": "1.0.0"
+}
+```
 
 CommandHook patches `ChatCommandApi.Execute` and dispatches to whoever
 has registered. Your mod doesn't patch anything itself, it just implements
@@ -28,7 +42,7 @@ path where the command actually ran.
 `CommandData` is passed by `ref` the whole way through, no allocation per
 command.
 
-## Example
+### Example
 
 ```csharp
 public class MyListener : ICommandHookListener
@@ -83,4 +97,3 @@ public override void Dispose()
 
 Calling `Register` again with the same `ModId` replaces your existing
 registration. If your `Commands` list hasn't changed, it's a no-op.
-