Added demo of TQDMProgressBar() for evaluate() (tensorflow#1674)

* Added demo of TQDMProgressBar() for evaluate()

* demo screenshot added

* verbose added

docs/tutorials/tqdm_progress_bar.ipynb

@@ -278,6 +278,24 @@
         "**Below is the expected output when you run the cell above**\n",
         "![TQDM Progress Bar Figure](https://raw.githubusercontent.com/tensorflow/addons/59961669a0e21eb4c045d4ad38d008a529d566c2/docs/tutorials/assets/tqdm_progress_bar_demo.png)"
       ]
-    }
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
+      "metadata": {},
+      "outputs": [],
+      "source": [
+        "# TQDMProgressBar() also works with evaluate()\n",
+        "model.evaluate(x_test, y_test, batch_size=64, callbacks=[tqdm_callback], verbose=0)"
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {},
+      "source": [
+        "**Below is the expected output when you run the cell above**\n",
+        "![TQDM Evaluate Progress Bar Figure](https://user-images.githubusercontent.com/20843596/79412655-a57cef00-7fc3-11ea-9bea-ade8ee8dad58.PNG)"
+      ]
+    },
   ]
 }