feat: Ajout d'un groupe de tâches

src/services/group.service.ts

@@ -7,4 +7,13 @@ export class GroupService extends BaseService {
   public getGroups(): Observable<Group[]> {
     return this.get<Group[]>("group");
   }
+
+  public addGroup(name:string):Observable<Group>{
+    let body:Group = {
+      id_group:0,
+      name_group:name,
+    };
+
+    return this.post<Group>("group/add",body);
+  }
 }