Create technical_improvement.md

Author: garethyr

.github/ISSUE_TEMPLATE/technical_improvement.md

@@ -0,0 +1,17 @@
+---
+name: Technical improvement
+about: Suggest a direct improvement to the project's code or design.
+title: ''
+labels: enhancement, refactor
+assignees: ''
+
+---
+
+**Describe the Problem**
+A clear and concise description of what is wrong with the code or design, i.e. what needs improving.
+
+**Describe the Improvement**
+A clear and concise description of how you think the improvement should work.
+
+**Additional context**
+Add any other context or technical improvement here. This can include line numbers, links to useful discussions/articles/tutorials, etc.