Competitive programming textprocessing (#8182)

* Added CP topic- Text processing

* Added Text Processing Cp Topic

* Added strings topic for Competitive programming

* Update free-courses-hi.md

courses/free-courses-hi.md

@@ -138,6 +138,7 @@
 
 * [Competitive Programming/DSA Course \| Hindi](https://www.youtube.com/playlist?list=PLauivoElc3ggagradg8MfOZreCMmXMmJ-) - Luv
 * [Full course in Competitive programming [ Hindi ] \|\| -by prince](https://www.youtube.com/playlist?list=PLzjZaW71kMwTGbP1suqY16w1VSb9ZNuvE) - Hello World
+* [Text Processing - Level 3](https://youtube.com/playlist?list=PL-Jc9J83PIiEoZSwjEZT3TvpKG16FntFL) - Pepcoding
 
 
 ### Compiler Design