Add text classification model

frontend/models/tasks/text-classification.ts

@@ -0,0 +1,22 @@
+export class TextClassificationItem {
+  constructor(
+    public id: number,
+    public label: number,
+    public user: number,
+  ) {}
+
+  static valueOf(
+    { id, label, user }:
+    { id: number, label: number, user: number }
+  ): TextClassificationItem {
+    return new TextClassificationItem(id, label, user)
+  }
+
+  toObject(): Object {
+    return {
+      id: this.id,
+      label: this.label,
+      user: this.user
+    }
+  }
+}