add markdown and simple text file for testing

Author: digitronik

tests/dir/markdown.md

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+# Markdown sample file
+
+## Links:
+[source](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#links)
+
+[www](www.google.com)
+
+[title - http](http://www.google.com "Google's Homepage")
+
+[title - https](https://www.google.com "Google's Homepage")
+
+[attribute - https](https://github.com/digitronik/linkstatus)
+
+[reference-style link][Arbitrary case-insensitive reference text]
+
+[I'm a relative reference to a repository file](../../LICENSE)
+
+[You can use numbers for reference-style link definitions][1]
+
+
+Or leave it empty and use the [link text itself].
+
+URLs and URLs in angle brackets will automatically get turned into links. 
+http://www.example.com or <http://www.example.com> and sometimes 
+example.com (but not on Github, for example).
+
+Some text to show that the reference links can follow later.
+
+[arbitrary case-insensitive reference text]: https://www.mozilla.org
+[1]: http://slashdot.org
+[link text itself]: http://www.reddit.com
+
+[broken link](https://github.com/digitronic/linkstatus)