Create issue_template.md

Author: hathach

.github/issue_template.md

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+Thank you for using Adafruit project and libraries, 
+please review the following guidelines before creating an issue :
+
+- **Do not use GitHub issues for question or troubleshooting projects.**  Instead use
+  the forums at http://forums.adafruit.com. Only create issue if it is a bug, feature 
+  or discussion that requires **code changes to resolve**.
+
+- **Check our tutorial and examples** There is chance that our 
+[learn tutorial](https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/introduction) 
+and examples has useful information for you.
+
+- Please provide details that help us to reproduce your issue
+
+  - Your Board and BSP version
+  - Your OS (mac/windows/linux) and its version
+  - Steps to reproduce, or better your (simplifed) sketch if possible
+  - Serial deubg log (enable IDE's Debug Mode to lv1 or lv2)