Add the third lesson!

learning/03 Testing.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "69cf54db-101a-4cd3-8e68-1b7ba93078eb",
+   "metadata": {},
+   "source": [
+    "<h1 align=\"center\">Markov Chain Monte Carlo for fun and profit</h1>\n",
+    "<h1 align=\"center\"> 🎲 ⛓️ 👉 🧪 </h1>\n",
+    "\n",
+    "## Testing"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "58bef986-9d69-4ef6-8a64-9eaf29c3424e",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
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+ "nbformat": 4,
+ "nbformat_minor": 5
+}