Add line counting badge

README.md

@@ -10,6 +10,8 @@ https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/6874
 )](https://godoc.org/github.com/tendermint/tendermint)
 [![chat](https://img.shields.io/badge/slack-join%20chat-pink.svg)](http://forum.tendermint.com:3000/)
 [![license](https://img.shields.io/github/license/tendermint/tendermint.svg)](https://github.com/tendermint/tendermint/blob/master/LICENSE)
+[![](https://tokei.rs/b1/github/tendermint/tendermint?category=lines)](https://github.com/tendermint/tendermint)
+
 
 Branch    | Tests | Coverage | Report Card
 ----------|-------|----------|-------------