Add oauth post

content/guides.json

@@ -1,4 +1,14 @@
 [
+  {
+    "title": "OAuth — Open Authorization",
+    "description": "Learn and understand what is OAuth and how it works",
+    "url": "/guides/oauth",
+    "fileName": "oauth",
+    "featured": true,
+    "author": "kamranahmedse",
+    "updatedAt": "2020-06-28T19:59:14.191Z",
+    "createdAt": "2020-06-28T19:59:14.191Z"
+  },
   {
     "title": "JWT Authentication",
     "description": "Understand what is JWT authentication and how is it implemented",

content/guides/oauth.md

@@ -0,0 +1,3 @@
+[![](/guides/oauth.png)](/guides/asymptotic-notation.png)
+
+Here is the [original tweet](https://twitter.com/kamranahmedse/status/1276994010423361540) where this image was posted.