This is a pretty general request as there are a number of ways to stretch / skew sprites. What have you tried yourself? Have you attempted to make this shader before asking for one? It should just require some vertex tweaking in the shader depending on what you need.
If you have given it a shot and are having trouble then show us your code, tell us what isn't working, and maybe we can help you out in fixing the problem. Not to be rude but don't just ask people to give you code. Make sure you are researching and trying things out for yourself first.
