read ccli license from global config

src/app/services/config.service.ts

@@ -0,0 +1,16 @@
+import {Injectable} from '@angular/core';
+import {DbService} from './db.service';
+import {Observable} from 'rxjs';
+import {Config} from './config';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ConfigService {
+  constructor(private db: DbService) {
+  }
+
+  public get get$(): Observable<Config> {
+    return this.db.doc$<Config>('global/config');
+  }
+}