docs(cardinal): add docs for events. (#394)

docs/pages/Cardinal/API-Reference/Events.mdx

@@ -0,0 +1,30 @@
+# Events
+
+Reference documentation for Events.
+
+```go
+package systems
+
+import "pkg.world.dev/world-engine/cardinal"
+
+func exampleSystem(ctx cardinal.WorldContext) {
+    ctx.EmitEvent("This is an example event string")
+}
+```
+
+## Emit Events
+
+The `EmitEvent` method on `cardinal.WorldContext` will emit event to all clients under the subject "event".
+
+To see how to receive notifications go here: https://heroiclabs.com/docs/nakama/concepts/notifications/#receive-notifications (Unity)
+
+```go
+func (wCtx *worldContext) EmitEvent(event string)
+```
+
+### Parameters
+
+| Parameter   | Type                                          | Description                                                                                        |
+|-------------|-----------------------------------------------|----------------------------------------------------------------------------------------------------|
+| event       | string                                        | The string to emit as an event                                                                     |
+

docs/pages/Cardinal/API-Reference/_meta.json

@@ -12,5 +12,8 @@
   },
   "cql": {
     "title": "Cardinal Query Language (CQL)"
+  },
+  "Events": {
+    "title": "Events"
   }
 }