update contribution guidance, add git issue template

CONTRIBUTING.md

@@ -1,7 +1,11 @@
 # Contributing
 When contributing to this repository, please first discuss the change you wish
-to make, added functionality you'd like to see, or bug you've found via raising a 
-github issue or emailing [email protected].
+to make, added functionality you'd like to see, or bug you've found via one
+of the following:
+- Raising a github issue using the issue template;
+- Emailing [email protected];
+- Contacting the py-af-colours team on the data-vis govdatascience channel;
+- Using the Accessibility and Presentation/Dissemination of Statistics Basecamp groups.
 
 ## Pull/merge request process
 1. Branch from the `main` branch. If you are implementing a feature name it

ISSUE_TEMPLATE.md

@@ -0,0 +1,13 @@
+# Issue Template
+title: <Short title>
+author: <Full name>
+
+# Issue
+<Brief explanation of problem>
+
+# Proposed Change
+<If proposing new functionality; any ideas, suggestions, options, including links to guidance if relevant>
+
+# Type of Change Requested
+[ ] Bug fix
+[ ] New feature