Add '.gitea/ISSUE_TEMPLATE/suggestion.md'

.gitea/ISSUE_TEMPLATE/suggestion.md

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+---
+
+name: "Suggestion"
+about: "An idea for a new feature or other improvement"
+labels:
+- enhancement
+- help-wanted
+
+---
+
+# Before you submit...
+
+- [ ] Look for other open issues regarding similar ideas
+- [ ] Consider implementing it yourself and creating a pull request
+
+# Description
+
+(Description of the idea goes here. Be detailed, and attach diagrams and mockups if you think they'll help.)
+
+# Use case
+
+(Why would this idea be useful? Who would benefit the most from this?)