Good First Issue markdown template

Good-First-Issues.md

@@ -31,3 +31,33 @@ Steps:
 It's common that it takes longer to write mentoring instructions than to fix it yourself (as an experienced
 maintainer) - this is an investment in [making sbt easier to contribute to][] and a potential long-term
 contributor, possibly maintainer.
+
+## Markdown template
+
+I suggest saving the following markdown template as a GitHub ["Saved Reply"](https://github.com/settings/replies) so you can append it to an issue's original description:
+
+```
+---
+
+# Mentoring Instructions
+
+## Links
+
+
+
+## Solution
+
+
+
+## Testing
+
+
+
+## Motivation
+
+
+
+## Background
+
+
+```