Added basic Text sending

lib/api/marianumcloud/talk/sendMessage/sendMessage.dart

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+import 'package:http/http.dart' as http;
+import 'package:http/src/response.dart';
+import 'package:marianum_mobile/api/marianumcloud/talk/sendMessage/sendMessageParams.dart';
+import 'package:marianum_mobile/api/marianumcloud/talk/talkApi.dart';
+
+import '../../../apiParams.dart';
+
+class SendMessage extends TalkApi {
+  String chatToken;
+  SendMessage(this.chatToken, SendMessageParams params) : super("v1/chat/$chatToken", params);
+
+  @override
+  assemble(String raw) {
+
+  }
+
+  @override
+  Future<Response>? request(Uri uri, ApiParams? body, Map<String, String>? headers) {
+    if(body is SendMessageParams) {
+      return http.post(uri, headers: headers, body: body.toJson());
+    }
+    return null;
+  }
+  
+}

lib/api/marianumcloud/talk/sendMessage/sendMessageParams.dart

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+import 'package:json_annotation/json_annotation.dart';
+import 'package:marianum_mobile/api/apiParams.dart';
+
+part 'sendMessageParams.g.dart';
+
+@JsonSerializable(explicitToJson: true, includeIfNull: false)
+class SendMessageParams extends ApiParams {
+  String message;
+  int? replyTo;
+
+  SendMessageParams(this.message, {this.replyTo});
+
+  factory SendMessageParams.fromJson(Map<String, dynamic> json) => _$SendMessageParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$SendMessageParamsToJson(this);
+}

lib/api/marianumcloud/talk/sendMessage/sendMessageParams.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'sendMessageParams.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+SendMessageParams _$SendMessageParamsFromJson(Map<String, dynamic> json) =>
+    SendMessageParams(
+      json['message'] as String,
+      replyTo: json['replyTo'] as int?,
+    );
+
+Map<String, dynamic> _$SendMessageParamsToJson(SendMessageParams instance) {
+  final val = <String, dynamic>{
+    'message': instance.message,
+  };
+
+  void writeNotNull(String key, dynamic value) {
+    if (value != null) {
+      val[key] = value;
+    }
+  }
+
+  writeNotNull('replyTo', instance.replyTo);
+  return val;
+}

lib/api/marianumcloud/talk/sendMessage/sendMessageResponse.dart

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+import 'package:marianum_mobile/api/apiResponse.dart';
+
+class SendMessageResponse extends ApiResponse {
+
+}