Add altair example

Co-authored-by: salbaroudi <sean.al.baroudi@gmail.com>
Co-authored-by: Roy Keyes <roy.coding@gmail.com>

Author: 3 people

Examples.ipynb

@@ -435,6 +435,27 @@
     "Image(fig.to_image(format=\"png\", width=900, height=900))"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "tags": [
+     "ex",
+     "name:simple-histogram",
+     "package:altair"
+    ]
+   },
+   "outputs": [],
+   "source": [
+    "data = altair.X(\"cty\", bin=altair.Bin(step=2))\n",
+    "chart = (altair \\\n",
+    "    .Chart(mpg) \\\n",
+    "    .mark_bar() \\\n",
+    "    .encode(data, y=\"count()\")\n",
+    ")\n",
+    "Image(render_altair(chart))"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},