Added 2 courses. One is Dynamic Programming by take U forward and another is Advanced Database Systems by CMU Database Group(revised) (#10002)

* Added 2 courses

1. Dynamic Programming by take U forward
2. Advanced Database Systems by CMU Database Group

* Update free-courses-en.md

courses/free-courses-en.md

@@ -166,6 +166,7 @@
 * [Data Structures in C++ - For Beginners](https://www.udemy.com/course/data-structures-for-beginners-c-plusplus) - Pedro Mercado (Udemy)
 * [Dynamic Programming](https://www.youtube.com/playlist?list=PLMCXHnjXnTnto1pZVvH7rbZ9W5neZ7Yhc) - Gaurav Sen
 * [Dynamic Programming](https://www.youtube.com/playlist?list=PLDV1Zeh2NRsAsbafOroUBnNV8fhZa7P4u) - WilliamFiset
+* [Dynamic Programming Playlist \| Interview Questions \| Recursion \| Tabulation \| Striver \| C++ \| Java \| DSA \| Placements](https://www.youtube.com/playlist?list=PLgUwDviBIf0qUlt5H_kiKYaNSqJ81PMMY) - take U forward
 * [Graph Series by Striver \| C++ \| Java \| Interview Centric \| Algorithms \| Problems](https://www.youtube.com/playlist?list=PLgUwDviBIf0oE3gA41TKO2H5bHpPd7fzn) - take U forward
 * [Graph Theory playlist](https://youtube.com/playlist?list=PLDV1Zeh2NRsDGO4--qE8yH72HFL1Km93P) - WilliamFiset
 * [IIT Bombay Foundation of Data Structures (CS213.1x)](https://courses.edx.org/courses/course-v1:IITBombayX+CS213.1x+1T2017/course/)
@@ -490,6 +491,7 @@
 
 ### Databases
 
+* [15-721 Advanced Database Systems (Spring 2023)](https://www.youtube.com/playlist?list=PLSE8ODhjZXjYzlLMbX3cR0sxWnRM7CLFn) - CMU Database Group
 * [CMU Intro to Database Systems](https://youtube.com/playlist?list=PLSE8ODhjZXjaKScG3l0nuOiDTTqpfnWFf) - CMU Database Group
 * [Database Systems](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-830-database-systems-fall-2010/) (MIT's opencourseware)
 * [Database Systems - Cornell University Course (SQL, NoSQL, Large-Scale Data Analysis)](https://www.youtube.com/watch?v=4cWkVbC2bNE) - Professor Immanuel Trummer, freeCodeCamp.org