Create ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+If it's your first time here - or you forgot about them - make sure you read the [contribution guidelines](CONTRIBUTING.md), and then feel free to delete this line! 
+
+### Expected vs. Actual Behavior
+
+Describe the problem here. 
+
+### Reproduction Steps & System Config (win, osx, web, etc.)
+
+Let us know how we can reproduce this, and attach relevant files (if any). 
+
+### Proposed Solution (if any)
+
+Let us know what how you would solve this. 
+
+#### Optional: Affected Projects
+
+Does this issue propagate to other dependencies or dependents? If so, list them here!