Create enhancement.md

.github/ISSUE_TEMPLATE/enhancement.md

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+**Please Describe the problem to be solved**
+(Replace This Text: Please present a concise description of the problem to be addressed by this feature request. Please be clear what parts of the problem are considered to be in-scope and out-of-scope.)
+
+**(Optional): Suggest A Solution**
+(Replace This Text: A concise description of your preferred solution. Things to address include:
+* Details of the technical implementation
+* Tradeoffs made in design decisions
+* Caveats and considerations for the future
+
+If there are multiple solutions, please present each one separately.