Added installation instructions and license

README.rst

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+VBoxManage bash completion script
+=================================
+
+This version of the completion was initially based on Sebastian T. Hafner
+script. However, in some point of time I've decided to rewrite it almost from
+scratch.
+
+Current version of script was written and tested against VBoxManage in version
+4.3.28, and supports all commands (in some extent ;)).
+
+
+Installation
+============
+
+Either source the file::
+
+    $ . /path/to/this/repo/VBoxManage
+
+or add it to a proper place depending on your distribution. Ususal place would
+be:
+
+* ~/bash-completion.d/
+* /usr/local/etc/bash-completion.d/
+* /etc/bash_completion.d/
+* etc.
+
+It's also okay to copy it into some directory, and place proper line in
+``.profile`` or ``.bashrc``::
+
+    source /some/directory/VBoxManage
+
+License
+=======
+
+This software is licensed under 3-clause BSD license. See LICENSE file for
+details.