blog: update README

Change-Id: Id9a469d475a3e429418135b11bc7e7c7063224a5
Reviewed-on: https://go-review.googlesource.com/37722
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/README b/README
index 0ba461f..17bc1c9 100644
--- a/README
+++ b/README
@@ -1,3 +1,10 @@
 This repository holds the Go Blog server code and content.
 
 To submit changes to this repository, see http://golang.org/doc/contribute.html.
+
+To run the blog server locally:
+
+	go build -o blog.exe ./blog
+	./blog.exe
+
+and then visit http://localhost:8080/.