Create working scaffolding of triggering notifications

src/backend/base.ts

@@ -0,0 +1,9 @@
+import { BackendConfig } from "../types/config";
+import { Notification } from "../types/notification";
+
+export abstract class Backend {  
+  constructor(config: BackendConfig) {    
+  }
+
+  abstract notify(notification: Notification): void;
+}