add jupyter notebook demo

demo/find-max.ipynb

@@ -0,0 +1,68 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Parsons Puzzle Demo - `find_max`\n",
+    "\n",
+    "Construct a function by drag & dropping and reordering lines from the left to the right. The constructed function should return the maximum value of a given list `seq`. You can assume that all the items in the list are positive numbers."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "\n",
+       "        <iframe\n",
+       "            width=\"1000\"\n",
+       "            height=\"400\"\n",
+       "            src=\"http://parsons.problemsolving.io/puzzle/5f25ce927e9449c8af6a5edc295236ab\"\n",
+       "            frameborder=\"0\"\n",
+       "            allowfullscreen\n",
+       "        ></iframe>\n",
+       "        "
+      ],
+      "text/plain": [
+       "<IPython.lib.display.IFrame at 0x111f0e320>"
+      ]
+     },
+     "execution_count": 1,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# Ignore these two lines\n",
+    "\n",
+    "from IPython.display import IFrame\n",
+    "IFrame('http://parsons.problemsolving.io/puzzle/5f25ce927e9449c8af6a5edc295236ab', 1000, 400)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.7.3"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}