Demonstrate progress bars in the documentation

docs/io/output/progress_bars.ipynb

@@ -0,0 +1,63 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "cc613a48",
+   "metadata": {},
+   "source": [
+    "### Progress Bars for Simulation Run ###\n",
+    "TARDIS displays progress bars by default to track the simulation. The progress bars are not displayed in the documentation but show up when you run the notebook.\n",
+    "\n",
+    "![TARDIS Progress Bars](../images/progress_bars_demo.gif)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "6e6b8b8f",
+   "metadata": {},
+   "source": [
+    "You can disable the progress bars as well."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "319759fd",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from tardis import run_tardis\n",
+    "sim = run_tardis('tardis_example.yml', show_progress_bars = False)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e51d94c9",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "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": "3.7.10"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}