title and introduction in short tutorial

Author: MilagrosMarin

short_tutorials/DataJoint in 30mins.ipynb

@@ -1,5 +1,21 @@
 {
  "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "ceada63c",
+   "metadata": {},
+   "source": [
+    "# DataJoint tutorial in 30 mins"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "f6d12c96",
+   "metadata": {},
+   "source": [
+    "In this tutorial, you are going to learn how to build your first DataJoint pipeline, which is shown below:"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "301be40e",