Add `.editorconfig` file

The addition of the `/.editorconfig` file is made in order to
help define and maintain consistent coding styles between the
different editors and IDEs.

Ref: http://editorconfig.org/
Add MIT license

The addition of the `LICENSE.md` file is made in order to remove
any ambiguity and to provide a proper, highly permissive license,
recognized by the Open Source Initiative (OSI).
Add `.gitattributes` file

The addition of the `.gitattributes` file is made in order to make
Git automatically normalize line endings for all text-based files.

Ref: https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
     http://git-scm.com/docs/gitattributes#_end_of_line_conversion
v0.1.0