Add colab badge to segmentation primer

Author: bnmajor

notebooks/IDC_segmentation_primer.ipynb

@@ -1,6 +1,15 @@
 {
   "cells": [
     {
+      "attachments": {},
+      "cell_type": "markdown",
+      "metadata": {},
+      "source": [
+        "<a href=\"https://colab.research.google.com/github/ImagingDataCommons/IDC-Tutorials/blob/master/notebooks/IDC_segmentation_primer.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+      ]
+    },
+    {
+      "attachments": {},
       "cell_type": "markdown",
       "metadata": {
         "id": "gy9vfOYmSgiz"