When you add a repository to Bitbucket Cloud, you also get a wiki. The wiki is a simple place to keep documents. Some people use it as their project home page. The wiki is a Git repository, so you can clone it and edit it like any other source files For example, take a look at the TortoiseHg wiki on Bitbucket Cloud.
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Supported Markup Languages
In some cases, you can use a Bitbucket macro or the Bitbucket markup to do the same thing. The Bitbucket markup works in all languages; The Bitbucket macros work only with Creole markup.
Supported File Extensions
With the exception of Creole markup, Bitbucket supports the same markup in README files as it does in wiki files. This table lists the supported filename extensions and their corresponding mark up languages:
For Bitbucket wikis only, not supported with README files.