Update issue templates

Author: dreampiggy

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,15 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+### New Feature Request Checklist
+
+* [ ] I have checked the current documentations or APIs and does not find a solution
+* [ ] I have searched for a similar issue in the [project](https://github.com/SDWebImage/SDWebImagePhotosPlugin/issues) and found none
+
+
+### Feature Request Description
+
+Please fill in the detailed description about feature request, including the feature use case (what you need) and the solution you want (like usage, demo code, ...)