go.talks: update README with App Engine deployment instructions

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/97220043
diff --git a/README b/README
index fded028..397251f 100644
--- a/README
+++ b/README
@@ -4,4 +4,9 @@
 
 	go get code.google.com/p/go.tools/cmd/present
 
+To deploy these talks to App Engine, copy the go.tools/cmd/present directory to
+the root of this repository and run:
+
+	appcfg.py update -A your-app-id -V your-app-version /path/to/go.talks
+
 To submit changes to this repository, see http://golang.org/doc/contribute.html.