github: update issue template

Author: sainnhe

.github/ISSUE_TEMPLATE/bug_report_gui.yml

@@ -5,8 +5,16 @@ body:
   - type: markdown
     attributes:
       value: |
-        _Before reporting:_ search [existing issues](https://github.com/sainnhe/sonokai/issues?q=is%3Aissue+is%3Aopen+label%3Abug) and check the FAQ in help doc. Any bug report which doesn't follow the issue template and I can't reproduce will be closed.
+        _Before reporting:_ search [existing issues](https://github.com/sainnhe/sonokai/issues?q=is%3Aissue+is%3Aopen+label%3Abug) and check the FAQ in the help doc. Any bug report which doesn't follow the issue template and I can't reproduce will be closed.
 
+  - type: checkboxes
+    attributes:
+      label: "I have done the following steps before reporting this issue:"
+      options:
+      - label: I have searched the existing issues
+        required: true
+      - label: I have read the FAQ in the help doc
+        required: true
   - type: input
     attributes:
       label: "Operating system/version"

.github/ISSUE_TEMPLATE/bug_report_tui.yml

@@ -5,8 +5,16 @@ body:
   - type: markdown
     attributes:
       value: |
-        _Before reporting:_ search [existing issues](https://github.com/sainnhe/sonokai/issues?q=is%3Aissue+is%3Aopen+label%3Abug) and check the FAQ in help doc. Any bug report which doesn't follow the issue template and I can't reproduce will be closed.
+        _Before reporting:_ search [existing issues](https://github.com/sainnhe/sonokai/issues?q=is%3Aissue+is%3Aopen+label%3Abug) and check the FAQ in the help doc. Any bug report which doesn't follow the issue template and I can't reproduce will be closed.
 
+  - type: checkboxes
+    attributes:
+      label: "I have done the following steps before reporting this issue:"
+      options:
+      - label: I have searched the existing issues
+        required: true
+      - label: I have read the FAQ in the help doc
+        required: true
   - type: input
     attributes:
       label: "Operating system/version"