Add JSP (Java server pages) and servlet basics (#6786)

new course added

courses/free-courses-en.md

@@ -521,6 +521,7 @@
 * [Java Server Tutorials - Happy Coding](https://happycoding.io/tutorials/java-server/) - Kevin Workman
 * [Java tutorial for beginners](https://youtube.com/playlist?list=PLZPZq0r_RZOMhCAyywfnYLlrjiVOkdAI1) - Bro Code (YouTube)
 * [Java Tutorial for Complete Beginners](https://www.udemy.com/course/java-tutorial/) - John Purcell (Udemy)
+* [JSP (Java server pages) and servlet basics](https://www.udemy.com/course/jsp-servlet-free/) - StudyEasy Organisation, Chaand Sheikh (Udemy)
 * [Learn how to program: Java](https://www.learnhowtoprogram.com/java-june-2017) - Epicodus Inc.
 * [Learn Java](https://www.sololearn.com/learning/1068) - Sololearn *(email address required)*
 * [Object Oriented Programming (OOP) In Java Course](https://www.youtube.com/playlist?list=PL9gnSGHSqcno1G3XjUbwzXHL8_EttOuKk) - Kunal Kushwaha (YouTube)