feat: Implement slack authentication

packages/backend/src/apps/slack/index.ts

@@ -0,0 +1,15 @@
+import Authentication from './authentication';
+import {
+  IService,
+  IAuthentication,
+  IApp,
+  IJSONObject,
+} from '@automatisch/types';
+
+export default class Slack implements IService {
+  authenticationClient: IAuthentication;
+
+  constructor(appData: IApp, connectionData: IJSONObject) {
+    this.authenticationClient = new Authentication(appData, connectionData);
+  }
+}