fix(repository): Move backend code into subdirectory

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

backend/src/groups/group.entity.ts

@@ -0,0 +1,58 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import {
+  Column,
+  Entity,
+  JoinTable,
+  ManyToMany,
+  PrimaryGeneratedColumn,
+} from 'typeorm';
+
+import { User } from '../users/user.entity';
+
+@Entity()
+export class Group {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({
+    unique: true,
+  })
+  name: string;
+
+  @Column()
+  displayName: string;
+
+  /**
+   * Is set to denote a special group
+   * Special groups are used to map the old share settings like "everyone can edit"
+   * or "logged in users can view" to the group permission system
+   */
+  @Column()
+  special: boolean;
+
+  @ManyToMany((_) => User, (user) => user.groups, {
+    eager: true,
+  })
+  @JoinTable()
+  members: Promise<User[]>;
+
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
+  private constructor() {}
+
+  public static create(
+    name: string,
+    displayName: string,
+    special: boolean,
+  ): Omit<Group, 'id'> {
+    const newGroup = new Group();
+    newGroup.name = name;
+    newGroup.displayName = displayName;
+    newGroup.special = special; // this attribute should only be true for the two special groups
+    newGroup.members = Promise.resolve([]);
+    return newGroup;
+  }
+}