Merge branch 'add-readme' into 'master'
Added a top-level README.md file in Markdown format. Added a `README.md` file in Markdown format. This file contains brief instructions to build XDMF from source code. The contents of this file are displayed on the project page at Gitlab. Additional documentation for new users may be added to this file in the future. @demarle See merge request !4
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