Sinhala courses (Youtube videos) added (#9604)

* Update free-courses-si.md

* Update free-courses-si.md

* Update free-courses-si.md

* Update free-courses-si.md

* Update free-courses-si.md

courses/free-courses-si.md

@@ -15,6 +15,11 @@
 * [WEB API-ASP.NET Core in Sinhala](https://youtube.com/playlist?list=PLvvtf05eMZ2CpeAsq93DqWJHHyvCSa2Qn) - Fiqri Ismail
 
 
+### Bootstrap
+
+* [Bootstap](https://youtube.com/playlist?list=PLXNgqM9ig24c7IdumyymD9q3e2hsz9U1m&feature=shared) - Udith Sanjaya
+
+
 ### <a id="csharp"></a>C\#
 
 * [C# Full Course in Sinhala](https://youtube.com/playlist?list=PLvvtf05eMZ2CXD2JdZgSBgyl13ODqHOkO) - Fiqri Ismail
@@ -22,7 +27,9 @@
 
 ### HTML and CSS
 
-* [HTML සිංහලෙන්](https://youtube.com/playlist?list=PLWAgeLqk4SjDlN6nHs91rECgx4PbzfoZh) - SL Geek School
+*  [CSS - Sinhala](https://youtube.com/playlist?list=PLXNgqM9ig24fvVI7DQZdJCR8Z8NqyvecA&feature=shared) - Uditha Sanjaya
+*  [HTML - Sinhala](https://youtube.com/playlist?list=PLXNgqM9ig24fJcb80ksUvFzaK6TYxMOir&feature=shared) - Udith Sanjaya
+*  [HTML සිංහලෙන්](https://youtube.com/playlist?list=PLWAgeLqk4SjDlN6nHs91rECgx4PbzfoZh) - SL Geek School
 
 
 ### Java
@@ -34,6 +41,7 @@
 
 ### JavaScript
 
+* [Java Script - Sinhala](https://youtube.com/playlist?list=PLXNgqM9ig24cM_oJq3xT4_paCMDKh4w2j&feature=shared) - Udith Sanjaya
 * [JavaScript Tutorial in Sinhala](https://youtube.com/playlist?list=PLYmyc7wRFoQjxkHAzHh1UIdU7ZdjTQvQt) - BestJobsLK
 
 
@@ -42,12 +50,18 @@
 * [PHP Full Course in Sinhala | 2022](https://www.youtube.com/watch?v=RdxtOQUflrk) - AUK Learning Center
 
 
-#### React
+### Python
+
+* [Python Sinhala](https://youtube.com/playlist?list=PLXNgqM9ig24fNnzfhOUXduubQW-zfb9eV&feature=shared) - Udith Sanjaya
+
+
+### React
 
 * [Fundamentals \| React JS in Sinhala](https://youtube.com/playlist?list=PLvvtf05eMZ2DpDyWwmAjEuicvVxx4vIYB) - Fiqri Ismail
 * [MERN Stack Developer - Beginners](https://www.youtube.com/playlist?list=PLvfC6i-hEZBnqqF7giszuYI0iqenU5NY0) -  TechWithGeorge
 * [REACT | MERN CRUD App in Sinhala](https://youtube.com/playlist?list=PLtoqJbwHBeHzAooLCGOzYVE9mkAeCnT9y) - Haritha Weerathunga
 * [React JS Full Course in Sinhala | 2023](https://www.youtube.com/watch?v=tM02uzhHDPI&t=759s) -  AUK Learning Center
+* [React Js Tutorial - Sinhala](https://youtube.com/playlist?list=PL68g11dFe-_VDZNEjp3E4lD_OWaEEj0PY&feature=shared) - Code With Banchi 
 
 
 #### Spring Boot