docs: README

README.rst

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+ymlf - Command-line YAML parser / filter
+========================================
+
+.. image:: https://travis-ci.com/safl/ymlf.svg?branch=master
+   :target: https://travis-ci.com/safl/ymlf
+
+Command-line tool that parses **YAML** from `stdin` and writes the parsed
+**YAML**, or a subset thereof, to `stdout`.
+
+Please take a look at the documentation for how to install and use ``ymlf``:
+
+* `Installation`_
+* `Usage`_
+
+If you find bugs or need help then feel free to submit an `Issue`_. If you want
+to get involved head over to the `GitHub page`_ to get the source code and
+submit a pull-request with your changes.
+
+.. _Python Package Index: https://pypi.org
+.. _Installation: https://kmdo.readthedocs.io/
+.. _Usage: https://kmdo.readthedocs.io/
+.. _GitHub page: https://github.com/safl/ymlf
+.. _Issue: https://github.com/safl/ymlf/issues