[Initiatives.wiki] Create Update Core App Screenshots

[Sophie Herold <sophieherold src gnome org>]

commit 8ca5736250ed29c19b2d52799e57e2af2e7f126d
Author: Sophie Herold <sophie hemio de>
Date:   Sat Feb 19 00:48:14 2022 +0000

    Create Update Core App Screenshots

 Update-Core-App-Screenshots.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
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diff --git a/Update-Core-App-Screenshots.md b/Update-Core-App-Screenshots.md
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+### [Initative #34: Update Core App Screenshots](#34)
+
+#### General guidance
+
+- Use 100% scale (no "High DPI") setting until screenshot scales [are 
supported](https://github.com/ximion/appstream/issues/114)
+- Provide multiple screenshots showing off the main areas of the app
+- Show off the app with realistic and good-looking example content
+- Update screenshots when the app UI changes
+- Use GNOME system defaults (stylesheet, font, icons, window decorations, etc.)
+
+#### Avoid
+- Using a non-standard system stylesheet or icons
+- Using non-standard window decorations (e.g. minimize/maximize enabled)
+
+[Appstream 
documentation](https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-screenshots)
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