Add guide on single sign on

content/guides.json

@@ -1,4 +1,14 @@
 [
+  {
+    "title": "SSO — Single Sign On",
+    "description": "Learn the basics of SAML and understand how does Single Sign On work.",
+    "url": "/guides/sso",
+    "fileName": "sso",
+    "featured": true,
+    "author": "kamranahmedse",
+    "updatedAt": "2020-07-01T19:59:14.191Z",
+    "createdAt": "2020-07-01T19:59:14.191Z"
+  },
   {
     "title": "OAuth — Open Authorization",
     "description": "Learn and understand what is OAuth and how it works",

content/guides/sso.md

@@ -0,0 +1,3 @@
+[![](/guides/sso.png)](/guides/sso.png)
+
+Here is the [original tweet](https://twitter.com/kamranahmedse/status/1280266408434302979) where this image was posted.

content/roadmaps.json

@@ -43,7 +43,7 @@
       "2018",
       "2017"
     ],
-    "contributorsCount": 2,
+    "contributorsCount": 3,
     "contributorsUrl": "/frontend/contributors",
     "url": "/frontend",
     "sidebar": {}