Add issue templates

Add issue templates for proposing new conventions and reporting issue in an existing convention

.github/ISSUE_TEMPLATE/issue-in-an-existing-convention.md

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+---
+name: Issue in an existing convention
+about: Is there a guideline that is incorrect, unclear, or could be improved?
+title: ''
+labels: issue
+assignees: ''
+
+---
+
+# What convention is being referenced?
+
+
+# How do you propose this convention could be improved? Please provide rationale and examples if possible.

.github/ISSUE_TEMPLATE/propose-a-new-convention.md

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+---
+name: Propose a new convention
+about: Think the guide is missing something? Propose a new convention here.
+title: ''
+labels: new convention
+assignees: ''
+
+---
+
+# Convention
+
+
+# Rationale
+
+
+# Example