Update free-programming-books-langs.md (#6452)

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Design Patterns In Java .. HTML Page Link Add

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add web page link

* Update free-programming-books-langs.md

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Java Masters Web Page Link Update!
- OOPs Concepts in Java
- Exception Handling
- Java Collection
- Framework
- Java Concurrency
- Java Web Programming
- Spring

* Update free-programming-books-langs.md

Java Masters Web Page Link Update!
- OOPs Concepts in Java
- Exception Handling
- Java Collection
- Framework
- Java Concurrency
- Java Web Programming
- Spring

* Update free-programming-books-langs.md

Web Page -> HTML

books/free-programming-books-langs.md

@@ -1027,6 +1027,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Java Application Development on Linux (2005)](https://ptgmedia.pearsoncmg.com/images/013143697X/downloads/013143697X_book.pdf) - Carl Albing and Michael Schwarz (PDF)
 * [Java, Java, Java Object-Oriented Problem Solving](https://archive.org/details/JavaJavaJavaObject-orientedProblemSolving/page/n0) - R. Morelli and R.Walde
 * [Java Language and Virtual Machine Specifications](https://docs.oracle.com/javase/specs/) - James Gosling, et al
+* [Java Masters](https://javamasters.io/servlets) - Java Masters (HTML)
 * [Java Notes for Professionals](http://goalkicker.com/JavaBook/) - Compiled from StackOverflow documentation (PDF)
 * [Java Programming](https://en.wikibooks.org/wiki/Java_Programming) - Wikibooks
 * [Java Programming for Kids](https://yfain.github.io/Java4Kids/) - Yakov Fain