feat: document the didReceiveDeepLink clientbound event

Author: nekename

src/4_clientbound/deep_link.md

@@ -0,0 +1,22 @@
+# Deep link
+
+### didReceiveDeepLink
+
+Fired when a deep link URL matching a format for sending messages to the plugin is opened.
+
+The URL formats that can trigger this event are
+- `openaction://plugins/message/<PLUGIN_DIRECTORY_NAME>/<MESSAGE_CONTENT>[?openaction=hidden]` and
+- `streamdeck://plugins/message/<PLUGIN_UUID>/<MESSAGE_CONTENT>[?streamdeck=hidden]`,
+
+where the optional query parameter specifies that the OpenAction server's window should not be brought to the foreground when the deep link is opened.
+
+**Received by:** Plugin
+
+```ts
+{
+	event: string = "didReceiveDeepLink",
+	payload: {
+		url: string
+	}
+}
+```

src/SUMMARY.md

@@ -7,6 +7,7 @@
 - [Registration](3_registration.md)
 - [Clientbound events](4_clientbound/0_index.md)
     - [Applications](4_clientbound/applications.md)
+    - [Deep link](4_clientbound/deep_link.md)
     - [Devices](4_clientbound/devices.md)
     - [Encoder](4_clientbound/encoder.md)
     - [Keypad](4_clientbound/keypad.md)