Update free-programming-playgrounds.md (#10605)

* Update free-programming-playgrounds.md

adding live code for general purpose with supporting a lot of PL

* Update free-programming-playgrounds.md

more/free-programming-playgrounds.md

@@ -173,6 +173,7 @@
 * [Grid Garden](https://cssgridgarden.com) - Codepip
 * [Learn advanced html and css](https://www.theodinproject.com/paths/full-stack-javascript/courses/advanced-html-and-css) - The Odin Project
 * [Learn Intermediate html and css](https://www.theodinproject.com/paths/full-stack-javascript/courses/intermediate-html-and-css) - The Odin Project
+* [LiveCode](https://livecodes.io) - LiveCode
 * [SoloLearn](https://code.sololearn.com/web#css)
 * [Tailwind Play](https://play.tailwindcss.com)