Added logo of libgdx to index.md file (#22283)
Added logo of libgdx to index.md file (#22283)

* Added logo of libgdx to index.md file

Added logo of libgdx to index.md file

References: 
![logo](http://libgdx.badlogicgames.com/img/logo.png)

* remove duplicate image, moved it to the top...

add line breaks between resources

BhaveshSGupta/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp,raisedadead/FreeCodeCamp,jonathanihm/freeCodeCamp,jonathanihm/freeCodeCamp,raisedadead/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp