Create ISSUE_TEMPLATE.md

Author: 1amageek

ISSUE_TEMPLATE.md

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+### [REQUIRED] Step 1: Describe your environment
+
+  * Xcode version: _____
+  * Pring version: _____
+
+### [REQUIRED] Step 3: Describe the problem
+
+#### Steps to reproduce:
+
+What happened? How can we make the problem occur?
+This could be a description, log/console output, etc.
+
+#### Relevant Code:
+
+```
+// TODO(you): code here to reproduce the problem
+```