Added Issue Template

ISSUE_TEMPLATE.md

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+### New Issue Checklist
+
+🚫 If this template is not filled out your issue **will** be closed with no comment. 🚫
+
+* [ ] I have looked at the [Documentation](https://github.com/SnapKit/Masonry/blob/master/README.md)
+* [ ] I have filled out this issue template.
+
+### Issue Info
+
+ Info                    | Value                               |
+-------------------------|-------------------------------------|
+ Platform                | e.g. ios/osx/tvos
+ Platform Version        | e.g. 8.0
+ Masonry Version         | e.g. 1.0
+ Integration Method      | e.g. carthage/cocoapods/manually
+ 
+
+### Issue Description
+
+⚠️ Replace this with the description of your issue. ⚠️