Added new web development course (#6192)

* Added new web development course

* Update free-courses-en.md

* Added new language to "Podcast - Screencast"

* Create free-podcasts-screencasts-si.md

README.md

@@ -132,6 +132,7 @@ Free Podcasts and Screencasts:
 + [Portuguese (Brazil)](casts/free-podcasts-screencasts-pt_BR.md)
 + [Portuguese (Portugal)](casts/free-podcasts-screencasts-pt_PT.md)
 + [Russian / Русский язык](casts/free-podcasts-screencasts-ru.md)
++ [Sinhala / සිංහල](casts/free-podcasts-screencasts-si.md)
 + [Spanish / español / castellano](casts/free-podcasts-screencasts-es.md)
 + [Swedish / Svenska](casts/free-podcasts-screencasts-se.md)
 + [Turkish / Türkçe](casts/free-podcasts-screencasts-tr.md)

casts/free-podcasts-screencasts-si.md

+### Index
+
+* [FOSS](#foss)
+
+
+### FOSS
+
+* [SLIIT FOSSCAST](https://anchor.fm/sliit-foss-community) - SLIIT FOSS Community

courses/free-courses-en.md

@@ -897,6 +897,7 @@
 
 * [ASP.NET Core Tutorial For Beginners](https://www.youtube.com/playlist?list=PL6n9fhu94yhVkdrusLaQsfERmL_Jh4XmU) - Venkat (Pragim Technologies)
 * [Command Line Power User - for web developers](https://commandlinepoweruser.com) - WesBos (email address *required*)
+* [Create a Professional Website with Velo by Wix](https://www.codecademy.com/learn/create-a-professional-website-with-velo-by-wix) - Codecademy
 * [CS50’s Web Programming with Python and JavaScript](https://cs50.harvard.edu/web/2020/) - Brian Yu, David J. Malan (edX Harvard CS50)
 * [Discover Flask - Full Stack Web Development with Flask](https://github.com/realpython/discover-flask)
 * [Essential Nextjs Typescript Tailwind Stack](https://www.youtube.com/playlist?list=PLKEkvhqFCRwL94nLP-TdIfNmbiZk5FCMx) - Fireship, Ben Awad, Traversy Media, Devs Force