luci-go: Improving setup instructions in README.md

README.md

 luci-go: LUCI services and tools in Go
 ======================================
 
 [![GoDoc](https://godoc.org/github.com/luci/luci-go?status.svg)](https://godoc.org/github.com/luci/luci-go)
 [![Build Status](https://travis-ci.org/luci/luci-go.svg?branch=master)](https://travis-ci.org/luci/luci-go)
 [![Coverage Status](https://coveralls.io/repos/luci/luci-go/badge.svg?branch=master&service=github)](https://coveralls.io/github/luci/luci-go?branch=master)
 
 Installing
 ----------
 
+If you already have a go environment and are developing outside of Chrome
+infrastructure:
+
     go get -u github.com/luci/luci-go/client/cmd/...
     go get -u github.com/luci/luci-go/server/cmd/...
 
+Otherwise you should use [Chromium infra/go area](https://chromium.googlesource.com/infra/infra/+/master/go/README.md).
+You can use their [`quicksetup`](https://chromium.googlesource.com/infra/infra/+/master/go/quicksetup.sh)
+script to get such an environment like this:
+
+    cd /where/you/want/source/code
+    wget -O- "https://chromium.googlesource.com/infra/infra/+/master/go/quicksetup.sh?format=TEXT" | base64 -d | bash
+
 
 Code layout
 -----------
 
   * [/appengine/...](https://github.com/luci/luci-go/tree/master/appengine)
     contains [AppEngine](https://cloud.google.com/appengine/docs/go/) server
     code. It imports packages from `/common/...` and `/server/...`.
   * [/client/...](https://github.com/luci/luci-go/tree/master/client) contains
     all client code.
   * [/common/...](https://github.com/luci/luci-go/tree/master/common) contains
@@ skipping 33 matching lines @@
     # hack hack
 
     git commit -a -m "This is awesome\nR=joe@example.com"
     # This will ask for your Google Account credentials.
     git cl upload -s
     # Wait for LGTM over email.
     # Check the commit queue box in codereview website.
     # Wait for the change to be tested and landed automatically.
 
 Use `git cl help` and `git cl help <cmd>` for more details.