doc: update README to recommend a binary install

Also, rename to README.md so that it will be displayed at
	https://go.googlesource.com/tour

Fixes golang/go#15846

Change-Id: I8303ec53b0bdf32b5c899321c40a85107a27aceb
Reviewed-on: https://go-review.googlesource.com/23466
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/README b/README
deleted file mode 100644
index 001e825..0000000
--- a/README
+++ /dev/null
@@ -1,13 +0,0 @@
-This is Go Tour, an introduction to the Go programming language.
-
-To install the tour locally, first install Go, then run:
-
-	$ go get golang.org/x/tour/gotour
-	$ cd $GOPATH/bin
-	$ ./gotour
-
-Unless otherwise noted, the go-tour source files are distributed
-under the BSD-style license found in the LICENSE file.
-
-Contributions should follow the same procedure as for the Go project:
-http://golang.org/doc/contribute.html
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6be93ef
--- /dev/null
+++ b/README.md
@@ -0,0 +1,19 @@
+A Tour of Go is an introduction to the Go programming language.
+
+The easiest way to install the tour locally is to install
+[a binary release of Go](https://golang.org/dl/) and then run:
+
+	$ go tool tour
+
+To install the tour from source, first 
+[set up a workspace](https://golang.org/doc/code.html) and then run:
+
+	$ go get golang.org/x/tour/gotour
+
+This will place a `gotour` binary in your workspace's `bin` directory.
+
+Unless otherwise noted, the go-tour source files are distributed
+under the BSD-style license found in the LICENSE file.
+
+Contributions should follow the same procedure as for the Go project:
+http://golang.org/doc/contribute.html