add create event

lib/models/content/content.dart

@@ -1,16 +1,18 @@
 import "package:collection/collection.dart";
 import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/create.dart";
 import "package:nexus/models/content/membership.dart";
 import "package:nexus/models/content/message.dart";
 
 class Content {
   Content();
-  factory Content.fromJson(Map<String, dynamic> json) => Content();
 
+  factory Content.fromJson(Map<String, dynamic> json) => Content();
   Map<String, dynamic> toJson() => {};
+
   static Content fromEventJson(Map<String, dynamic> eventJson) =>
       (EventType.values
-          .firstWhereOrNull((eventType) => eventType == eventJson["type"])
+          .firstWhereOrNull((eventType) => eventType.type == eventJson["type"])
           ?.contentFromJson ??
       Content.fromJson)(eventJson);
 }
@@ -19,6 +21,7 @@ class Content {
 enum EventType {
   encrypted("m.room.encrypted", Content.fromJson),
   membership("m.room.member", MembershipContent.fromJson),
+  create("m.room.create", CreateContent.fromJson),
   message("m.room.message", MessageContent.fromJson);
 
   final String type;

lib/models/content/create.dart

@@ -0,0 +1,35 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+import "package:freezed_annotation/freezed_annotation.dart";
+import "package:nexus/models/content/content.dart";
+part "create.freezed.dart";
+part "create.g.dart";
+
+@freezed
+abstract class CreateContent extends Content with _$CreateContent {
+  CreateContent._();
+  const factory CreateContent({
+    @JsonKey(name: "creator") String? creatorId,
+
+    @JsonKey(name: "additional_creators")
+    @Default(IList.empty())
+    IList<String> additionalCreatorIds,
+
+    PreviousRoom? predecessor,
+
+    @JsonKey(name: "m.federate") @Default(true) bool federated,
+
+    @Default("1") String roomVersion,
+    required String type,
+  }) = _CreateContent;
+
+  factory CreateContent.fromJson(Map<String, Object?> json) =>
+      _$CreateContentFromJson(json);
+}
+
+@freezed
+abstract class PreviousRoom with _$PreviousRoom {
+  const factory PreviousRoom({required int roomId}) = _PreviousRoom;
+
+  factory PreviousRoom.fromJson(Map<String, Object?> json) =>
+      _$PreviousRoomFromJson(json);
+}