add a block of md

Author: FlyingWithJerome

sensors/04-netCDF-tutorial.ipynb

@@ -208,6 +208,15 @@
     "    print name"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Read the values and attributes of a Group/Variable-in-a-Group\n",
+    "\n",
+    "- Python netCDF4 library provides serveral ways to let users get access to the attributs and values of them, as litsed below"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,