Update README.md

Author: munagavenkat

README.md

@@ -1,3 +1,5 @@
 # Identity Server 4
 
-It is a .NET solution to build identity and access control for modern applications, including single sign-on, identity management, authorization, and API security
+It is a .NET solution to build identity and access control for modern applications, including single sign-on, identity management, authorization, and API security.
+
+The solution is with .Net Framework 4.7.2 and Visual Studio 2019.