PrivateAPI: Add history controller

Signed-off-by: Philip Molares <philip.molares@udo.edu>

src/history/history-entry-creation.dto.ts

@@ -0,0 +1,15 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { IsString } from 'class-validator';
+
+export class HistoryEntryCreationDto {
+  /**
+   * ID or Alias of the note
+   */
+  @IsString()
+  note: string;
+}