add vendoring

vendor/github.com/gogs/chardet/README.md

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+# chardet
+
+chardet is library to automatically detect
+[charset](http://en.wikipedia.org/wiki/Character_encoding) of texts for [Go
+programming language](http://golang.org/). It's based on the algorithm and data
+in [ICU](http://icu-project.org/)'s implementation.
+
+The project was created by [saintfish](http://github.com/saintfish/chardet). In January 2015 it was forked by the gogits project in order to incorporate bugfixes and new features.
+
+## Documentation and Usage
+
+See [pkgdoc](http://godoc.org/github.com/gogs/chardet)