Docs: Add icon section to issue template (#1377)

Author: tordans

.github/ISSUE_TEMPLATE/0-enhancement.yaml

@@ -82,6 +82,13 @@ body:
       placeholder: '126,000'
     validations:
       required: true
+  - type: input
+    attributes:
+      label: Suggested Icon
+      description: Each preset needs an icon ([learn more…](https://github.com/ideditor/schema-builder/blob/main/ICONS.md#icons)). Any suggestion, yet, on which? Or do we need a new one?
+      placeholder: 'maki-park'
+    validations:
+      required: false
   - type: input
     attributes:
       label: Replaces other Tag?