Use "Issue" template for new issues

[ner00]

This might be helpful and also incentivize users to be more cooperative by providing useful information from the get go when opening new issues. Here are a couple examples of what I mean:

• https://github.com/libretro/RetroArch/issues/new
• https://github.com/hrydgard/ppsspp/issues/new

[spleen1981]

9f1e2e583d9a5a8609a30e5edfc02b4c2414100b