Add news about code of conduct

Author: adangel

_posts/2020-04-24-PMD-adopts-Contributor-Code-Of-Conduct.md

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+---
+layout: post
+title: PMD adopts Contributor Code of Conduct
+---
+
+To facilitate healthy and constructive community behavior PMD adopts
+[Contributor Convenant](https://www.contributor-covenant.org/) as its code of
+conduct.
+
+Please note that this project is released with a Contributor Code of Conduct.
+By participating in this project you agree to abide by its terms.
+
+You can find the code of conduct in the file [code_of_conduct.md](https://github.com/pmd/pmd/blob/master/code_of_conduct.md)
+in our repository.