add suggested solutions field in bug_report.yml

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -55,6 +55,16 @@ body:
       value: |-
         - Mermaid version:
         - Browser and Version: [Chrome, Edge, Firefox]
+  - type: textarea
+    attributes:
+      label: Suggested Solutions
+      description: >
+        If applicable, suggest solutions that could resolve the bug.
+        It would help maintainers/contributors to not waist time looking for some,
+        even pointing the line causing the bug would be great!
+      placeholder: |-
+        - Add a new option for ...
+        - Add a new type for ...
   - type: textarea
     attributes:
       label: Additional Context