go.empty: prototype for new subrepository

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5572056

.hgignore

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+syntax:glob
+last-change

AUTHORS

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+# This source code refers to The Go Authors for copyright purposes.
+# The master list of authors is in the main Go distribution,
+# visible at http://tip.golang.org/AUTHORS.

CONTRIBUTORS

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+# This source code was written by the Go contributors.
+# The master list of contributors is in the main Go distribution,
+# visible at http://tip.golang.org/CONTRIBUTORS.

README

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+This is an empty Go subrepository.  To create a new subrepository,
+visit http://code.google.com/p/go/adminSource and under repositories,
+type the new name, check [x] Clone contents and select [empty] as
+the one you want to clone.
+
+Then execute:
+	go get code.google.com/p/go.newrepo
+	cd $(go list -e -f '{{.Dir}}' code.google.com/p/go.newrepo)
+
+The go get will complain about not finding source code, but it will
+successfully check out the repository.
+
+Edit the README (this file) to describe the new subrepository, and then
+use the usual hg change, mail, submit to send in the change.
+You will need to follow http://golang.org/doc/contribute.html#Code_review
+to enable the Code Review extension (pointing into your Go root).

codereview.cfg

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+defaultcc: golang-dev@googlegroups.com
+contributors: http://go.googlecode.com/hg/CONTRIBUTORS