Add issue template

Author: jberkel

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,20 @@
+> Issues are used to track bugs and feature requests. 
+> Need  help or have a general question? Ask on Stack Overflow (tag sqlite.swift).
+
+## Build Information
+
+- Include the SQLite.swift version, commit or branch experiencing the issue.
+- Mention Xcode and OS X versions affected.
+- How do do you integrate SQLite.swift in your project? 
+    - manual
+    - CocoaPods
+    - Carthage
+    - Swift Package manager
+
+## General guidelines
+
+- Be as descriptive as possible.
+- Provide as much information needed to _reliably reproduce_ the issue.
+- Attach screenshots if possible.
+- Better yet: attach GIFs or link to video.
+- Even better: link to a sample project exhibiting the issue.