Can create a group

lib/helpers/groups_helper.dart

@@ -126,6 +126,17 @@ class GroupsHelper {
           .map((f) => cast<int>(f))
           .toSet();
 
+  /// Create a new group
+  ///
+  /// Throws in case of failure
+  static Future<int> create(String name) async {
+    final result = await APIRequest.withLogin("groups/create")
+        .addString("name", name)
+        .execWithThrow();
+
+    return result.getObject()["id"];
+  }
+
   /// Perform a simple membership request
   Future<bool> _simpleMembershipRequest(int groupID, String uri,
           {Map<String, String> args}) async =>