Created small documentation of how folder landing pages work

wiki/user-guide/creating-folder-landing-pages.md

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+<!-- TITLE: Creating folder landing pages -->
+
+When you visit _yoursite.com/path/to/folder_ and the folder exists, but there is no file ```folder.md```, then you will be prompted to create it. Then, when you visit _yoursite.com/path/to/folder_, ```folder.md``` will be served up as the home page.
+
+Note: the root of _yoursite.com_ serves up ```home.md``` as the front page of your site.
+
+## Listing all pages inside a folder
+
+The special path _yoursite.com/path/to/folder/all_ will display a list of all the pages inside a folder -- just like the top level "All Pages" link in the sidebar.