You can create an announcement banner that will be displayed to all organization members at the top of every page in the organization.
You can use Markdown to format your message. For more information, see "About writing and formatting on GitHub."
You can also set announcement banners at the enterprise level. For more information, see "Customizing user messages for your enterprise."
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In the upper-right corner of GitHub, select your profile photo, then click Your organizations.
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Next to the organization, click Settings.
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In the "Messages" section of the sidebar, click Announcement.
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Under "Announcement", in the text field, type the announcement you want displayed in a banner.
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Optionally, under "Expires on", select the calendar drop-down menu and click an expiration date.
Note: Announcements must either have an expiration date, be user dismissible, or both.
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Optionally, to allow each user to dismiss the announcement, select Allow users to dismiss the announcement.
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Optionally, to preview your message, click Preview.
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Click Save changes.