TW-692: Add ADR for send/listen event

docs/adr/0009-Instructions-for-naming-twake-events.md

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+# 7. Instructions for naming twake events
+
+Date: 2023-10-03
+
+## Status
+
+Accepted
+
+## Docs
+
+- [Spec](https://spec.matrix.org/v1.6/#events)
+
+## Context
+
+- All data exchanged through Matrix is represented as an “event”. In addition, we have local support events.
+- We can use local events to handle logic and behavior by injecting events into a defined stream.
+
+## How to name events
+- Below are the naming rules for events.
+- App.twake is the name of the application.
+- Inapp is event use for local support.
+- Profile is the name of the feature.
+- Avatar is the name of the event.
+ ex: 'app.twake.inapp.profile.avatar'   
+
+## How to use events.
+- Send event
+
+```
+class TwakeEventDispatcher {
+  static final TwakeEventDispatcher _twakeEventDispatcher =
+      TwakeEventDispatcher._instance();
+
+  factory TwakeEventDispatcher() {
+    return _twakeEventDispatcher;
+  }
+
+  TwakeEventDispatcher._instance();
+
+  void sendAccountDataEvent({
+    required Client client,
+    required BasicEvent basicEvent,
+  }) {
+    client.onAccountData.add(basicEvent);
+  }
+}
+
+twakeEventDispatcher.sendAccountDataEvent(
+      client: client,
+      basicEvent: BasicEvent(
+        type: TwakeInappEventTypes.uploadAvatarEvent,
+        content: profile.toJson(),
+      ),
+    );
+```
+- Listen event and handle it
+
+```
+client.onAccountData.stream.listen((event) {
+      Logs().d(
+        'FetchProfileMixin::onAccountData() - EventType: ${event.type} - EventContent: ${event.content}',
+      );
+      if (event.type == TwakeInappEventTypes.uploadAvatarEvent) {
+        profileNotifier.value = Profile.fromJson(event.content);
+      }
+    });
+```