Added image describing locking conditions.

Also split up introduction cell.

3.1-degrading-multisig-case-study.ipynb

@@ -26,14 +26,31 @@
     "## 3.1 Degrading Multisig Output\n",
     "\n",
     "In this case study, we consider a degrading multisig output, which provides recovery spending paths if the main wallet keys are lost or cannot sign. This output is expected to spent soon after being created. \n",
-    "The recovery spending paths include delays in case the back-up keys are compromised.\n",
-    "\n",
+    "The recovery spending paths include delays in case the back-up keys are compromised."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "![test](images/degrading_multisig0.jpg)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "#### Locking conditions\n",
     "\n",
     "* **multisig( 3/3 main wallet key )** - spendable immediately; or\n",
     "* **multisig( 2/3 main wallet keys + 1/2 backup keys )** - spendable after 3 days; or\n",
-    "* **multisig( 1/3 main wallet keys + 2/2 backup keys )** - spendable after 10 days.\n",
-    "\n",
+    "* **multisig( 1/3 main wallet keys + 2/2 backup keys )** - spendable after 10 days.\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "#### Signers\n",
     "\n",
     "* **Main wallet keys** - Keys A, B, C\n",