issue template

.github/ISSUE_TEMPLATE.md

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+### Check List
+
+Thanks for considering to open an issue. Before you submit your issue, please confirm these boxes are checked.
+
+- [ ] I have read the [wiki page](https://github.com/onevcat/Kingfisher/wiki) and [cheat sheet](https://github.com/onevcat/Kingfisher/wiki/Cheat-Sheet), but there is no information I need.
+- [ ] I have searched in [existing issues](https://github.com/onevcat/Kingfisher/issues?utf8=✓&q=is%3Aissue), but did find a same one.
+- [ ] I want to reoprt a problem instead of asking a question. It'd better to use [kingfisher tag in Stack Overflow](http://stackoverflow.com/questions/tagged/kingfisher) to ask a question.
+
+### Issue Description
+
+#### What
+
+[Tell us about the issue]
+
+#### Reproduce
+
+[The steps to reproduce this issue. What is the url you were trying to load, where did you put your code, etc.]
+
+#### Other Comment
+
+[Add anything else here]
+