Update issue templates

.github/ISSUE_TEMPLATE/topic-suggestion.md

@@ -0,0 +1,17 @@
+---
+name: Topic Suggestion
+about: 'Topic Suggestion: Add this topic to the book'
+title: 'Topic suggestion:'
+labels: topic
+assignees: ''
+
+---
+
+** What topic should be added? **
+Topic description
+
+** Who is this topic for [audience]? **
+Audience
+
+** Additional context **
+More info