Fix diagram

README.md

@@ -25,6 +25,7 @@ Better approach is to use Public(Certificates)/Private keys encryption scheme wh
 
 ## Current Approach
 
+```
   +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
   |          User Device          |
   |                               |
@@ -68,6 +69,7 @@ Better approach is to use Public(Certificates)/Private keys encryption scheme wh
   | +---------------------------+ | (4) Authorization  |               |
   |                               |     Code           +---------------+
   +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
+```
 
 ## Better Security Approach