feat: add new entity to entity mapping (#822)

Fixes: #767

src/app/system/system.service.ts

@@ -476,6 +476,16 @@ export class SystemService {
     return this.http.get(`/entitytoentitymapping/${mappingId}/${fromId}/${toId}`);
   }
 
+  /**
+   * Creates a new mapping
+   * @param {any} mapType Map id to be created.
+   * @param {any} mapData Map data to be added
+   * @returns {Observable<any>} resolved data
+   */
+  createMapping(mapType: any, mapData: any): Observable<any> {
+    return this.http.post(`/entitytoentitymapping/${mapType}`, mapData);
+  }
+
   /**
    * @returns {Observable<any>} Offices data
    */