Add CHANGELOG to project

[ci skip]

Author: ramsey

CHANGELOG.md

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+# Codeblock Extension for Twig Changelog
+
+## 1.0.1
+
+_Released: 2016-03-17_
+
+* Add project [Contributor Code of Conduct](https://github.com/ramsey/twig-codeblock/blob/master/CODE_OF_CONDUCT.md)
+* Update documentation and add contributing information
+* Cleanup code according to Scrutinzer issues
+
+## 1.0.0
+
+_Released: 2015-02-27_
+
+* Initial release