Add Google Colab link to model authentication notebook

Author: besirkurtulmus

model_authentication/model_authentication.ipynb

@@ -1,5 +1,15 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {
+    "colab_type": "text",
+    "id": "view-in-github"
+   },
+   "source": [
+    "<a href=\"https://colab.research.google.com/github/algorithmiaio/model-deployment/blob/master/model_authentication/model_authentication.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>\n"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},