README.md: update stale documentation

Remove stale badges.

Change-Id: I934881eebac49fed39d39a7217bc784a926b7949
Reviewed-on: https://chromium-review.googlesource.com/1176132
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
diff --git a/README.md b/README.md
index dc95be0..0690ab5 100644
--- a/README.md
+++ b/README.md
@@ -1,62 +1,28 @@
-gae: A Google AppEngine SDK wrapper
-===================
+# gae: A Google AppEngine SDK wrapper
+
 *designed for testing and extensibility*
 
 #### **THIS PACKAGE HAS NO API COMPATIBILITY GUARANTEES. USE UNPINNED AT YOUR OWN PERIL.**
 (but generally it should be pretty stableish).
 
-[![GoDoc](https://godoc.org/github.com/luci/gae?status.svg)](https://godoc.org/github.com/luci/gae)
-[![Build Status](https://travis-ci.org/luci/gae.svg?branch=master)](https://travis-ci.org/luci/gae)
-[![Coverage Status](https://coveralls.io/repos/luci/gae/badge.svg?branch=master&service=github)](https://coveralls.io/github/luci/gae?branch=master)
+[![GoDoc](https://godoc.org/go.chromium.org/gae?status.svg)](https://godoc.org/go.chromium.org/gae)
 
-Installing
-----------
 
-    go get -u go.chromium.org/gae/...
+## Installing
 
-Why/What/How
-------------
+LUCI Go GAE adaptor code is meant to be worked on from an Chromium
+[infra.git](https://chromium.googlesource.com/infra/infra.git) checkout, which
+enforces packages versions and Go toolchain version. First get fetch via
+[depot_tools.git](https://chromium.googlesource.com/chromium/tools/depot_tools.git)
+then run:
 
-See the [godocs](https://godoc.org/github.com/luci/gae).
+    fetch infra
+    cd infra/go
+    eval `./env.py`
+    cd src/go.chromium.org/gae
 
-Versioning
-----------
 
-  * Branch `master` contains the latest code.
+## Contributing
 
-Contributing
-------------
-
-  * Sign the [Google CLA](https://cla.developers.google.com/clas).
-  * Make sure your `user.email` and `user.name` are configured in `git config`.
-  * Install test-only packages:
-    `go get -u -t go.chromium.org/luci/client/...`
-  * Install the [pcg](https://github.com/maruel/pre-commit-go) git hook:
-    `go get -u github.com/maruel/pre-commit-go/cmd/... && pcg`
-
-Run the following to setup the code review tool and create your first review:
-
-    git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git $HOME/src/depot_tools
-    export PATH="$PATH:$HOME/src/depot_tools"
-    cd $GOROOT/go.chromium.org/luci
-    git checkout -b work origin/master
-
-    # hack hack
-    git commit -a -m "This is awesome"
-
-    # We use Gerrit for code review. Visit
-    # https://chromium-review.googlesource.com/new-password
-    # and follow instructions.
-
-    git cl upload -s --r-owners
-    # This will upload your change to Gerrit and pick a random owner (as defined
-    # in the OWNERS file) for review.
-    # Wait for approval and submit your code through Commit Queue.
-    # Commit queue will test your change on multiple platforms and land it
-    # automatically.
-
-    # Once you get a review with comments, you can do additional commits to your
-    # feature branch, and then upload again to update the review in gerrit.
-    $ git cl upload
-
-Use `git cl help` and `git cl help <cmd>` for more details.
+Contributing uses the same flow as [Chromium
+contributions](https://www.chromium.org/developers/contributing-code).