update README

Author: birdayz

README.md

@@ -1,7 +1,16 @@
-Kafka CLI
+# Kaf
+Kafka CLI inspired by kubectl & docker
 
 [![CircleCI](https://img.shields.io/circleci/project/github/infinimesh/kaf.svg)](https://circleci.com/gh/infinimesh/kaf/tree/master) 
 [![GoReportCard](https://goreportcard.com/badge/github.com/infinimesh/kaf)](https://goreportcard.com/report/github.com/infinimesh/kaf) 
 
 ![asciicinema](asciicinema.gif)
 
+## Install
+Install from source:
+
+```go get -u github.com/infinimesh/kaf```
+
+Install binary:
+
+```curl https://raw.githubusercontent.com/infinimesh/kaf/master/godownloader.sh | BINDIR=$HOME/bin bash```