Add GNOME Circle checklist

GNOME Circle.md

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+#### Metadata
+
+  - [ ] Screenshot quality ([more info](https://gitlab.gnome.org/GNOME/Initiatives/-/wikis/Update-App-Screenshots))
+  - [ ] "Summary" quality ([more info](https://gitlab.gnome.org/GNOME/Initiatives/-/wikis/App-Metadata#summary))
+  - [ ] .doap-file in repository exists and is up-to-date ([more info](https://gitlab.gnome.org/World/apps-for-gnome/-/blob/main/METADATA.md#doap))
+
+#### Accessibility
+
+  - [ ] Uses standard keyboard shortcuts ([more info](https://developer.gnome.org/hig/reference/keyboard.html))
+  - [ ] Works with Orca (activate via `Alt+Super+S`)
+      - [ ] Image buttons have a tooltip