Added ASP.NET books. (#4361)

* Added books.

* Removed a book.

* Added a book back.

free-programming-books.md

@@ -927,9 +927,15 @@ Kerridge (PDF) (email address *requested*, not required)
 
 ### ASP.NET
 
+* [Architecting Modern Web Applications with ASP.NET Core and Microsoft Azure (2020)](https://aka.ms/webappebook) - Steve "ardalis" Smith (PDF) (:construction: *in process*)
 * [ASP.NET Core 2 Succinctly](https://www.syncfusion.com/ebooks/aspnet-core-2-succinctly) - Simone Chiaretta, Ugo Lattanzi
 * [ASP.NET MVC Music Store](http://mvcmusicstore.codeplex.com)
 * [ASP.NET WebHooks Succinctly](https://www.syncfusion.com/ebooks/aspnet_webhooks_succinctly) - Gaurav Arora
+* [ASP.NET with C# (2008)](http://www.vijaymukhi.com/documents/books/vsnet/content.htm) - Vijay Mukhi, Sonal Mukhi, Neha Kotecha
+* [Diving into ASP.NET WebAPI (2016)](https://github.com/akhilmittal/FreeBooks/) - Akhil Mittal (PDF)
+* [Intro to ASPNET MVC 4 with Visual Studio 2011 Beta (2012)](http://download.microsoft.com/download/0/f/b/0fbfaa46-2bfd-478f-8e56-7bf3c672df9d/intro%20to%20asp.net%20mvc%204%20with%20visual%20studio%20-%20beta.pdf) - Rick Anderson and Scott Hanselman (PDF)
+* [Introducing ASP.NET Web Pages 2 (2012)](https://download.microsoft.com/download/0/F/B/0FBFAA46-2BFD-478F-8E56-7BF3C672DF9D/Introducing%20ASP.NET%20Web%20Pages%202.pdf) - Mike Pope (PDF)
+* [The Little ASP.NET Core Book (2018)](https://s3.amazonaws.com/recaffeinate-files/LittleAspNetCoreBook.pdf) - Nate Barbettini (PDF)
 
 
 ### Assembly Language