Add svelte resources (#5909)

* add svelte interactive tutorial

* add svelte courses

* add svelte to index

* move svelte resource to books listing

* move svelte resource to courses

books/free-programming-books-langs.md

@@ -112,6 +112,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
   * [React](#react)
   * [React Native](#react-native)
   * [Redux](#redux)
+  * [Svelte](#svelte)
   * [Vue.js](#vuejs)
 * [Jenkins](#jenkins)
 * [Julia](#julia)
@@ -1268,6 +1269,11 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [The Complete Redux Book](https://leanpub.com/redux-book) - Boris Dinkevich and Ilya Gelman  *(Leanpub account or valid email requested)*
 
 
+#### Svelte
+
+* [Svelte Tutorial](https://svelte.dev/tutorial/basics) - Svelte.dev
+
+
 #### Vue.js
 
 * [30 Days Of Vue](https://www.newline.co/30-days-of-vue) - Hassan Djirdeh (HTML; *email required for PDF*)

courses/free-courses-en.md

@@ -37,6 +37,7 @@
   * [React](#react)
   * [React Native](#react-native)
   * [Redux](#redux)
+  * [Svelte](#svelte)
   * [Vue.js](#vuejs)
 * [Kotlin](#kotlin)
 * [Kubernetes](#kubernetes)
@@ -508,6 +509,12 @@
 * [Learn Redux](https://learnredux.com) - Wes Bos (email address *requested*)
 
 
+#### Svelte
+
+* [Learn the Svelte JavaScript Framework](https://www.youtube.com/watch?v=ujbE0mzX-CU) - Noah Glaser, freeCodeCamp (YouTube)
+* [Svelte Tutorial](https://www.youtube.com/watch?v=vhGiGqZ78Rs) - Beau Carnes, freeCodeCamp (YouTube)
+
+
 #### Vue.js
 
 * [Internationalization with vue-i18n](https://vueschool.io/courses/internationalization-with-vue-i18n)