adding wiki pages via the online interface - nolboo/wiki-syntax GitHub Wiki
You can add new wiki pages directly to your repository using our web interface.
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On GitHub, navigate to the main page of the repository.
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Under your repository name, click Wiki.
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From the top menu bar, click New Page.
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Wiki pages can contain any markup that GitHub supports. The default choice is Markdown, but you can use the "Edit mode" drop-down menu to switch to a different markup language.
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Use the text editor to add your page's content. You can also use the wiki toolbar at the top for entering text using a graphical WYSIWYG editor.
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Enter a commit message describing the new file you're adding.
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To commit your changes to the wiki, click Save Page.