Add user notification base code

shared/models/users/user-notification.model.ts

@@ -0,0 +1,47 @@
+export enum UserNotificationType {
+  NEW_VIDEO_FROM_SUBSCRIPTION = 1,
+  NEW_COMMENT_ON_MY_VIDEO = 2,
+  NEW_VIDEO_ABUSE_FOR_MODERATORS = 3,
+  BLACKLIST_ON_MY_VIDEO = 4,
+  UNBLACKLIST_ON_MY_VIDEO = 5
+}
+
+interface VideoInfo {
+  id: number
+  uuid: string
+  name: string
+}
+
+export interface UserNotification {
+  id: number
+  type: UserNotificationType
+  read: boolean
+
+  video?: VideoInfo & {
+    channel: {
+      id: number
+      displayName: string
+    }
+  }
+
+  comment?: {
+    id: number
+    account: {
+      id: number
+      displayName: string
+    }
+  }
+
+  videoAbuse?: {
+    id: number
+    video: VideoInfo
+  }
+
+  videoBlacklist?: {
+    id: number
+    video: VideoInfo
+  }
+
+  createdAt: string
+  updatedAt: string
+}