Add a go_test to //build_tests

I wanted to provide an example for students to write tests. This
should hopefully get them started.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I5b5e5509075cc6e30f5138b3a213c8966fd15763
diff --git a/build_tests/go_greeter/greeter.go b/build_tests/go_greeter/greeter.go
new file mode 100644
index 0000000..53f837a
--- /dev/null
+++ b/build_tests/go_greeter/greeter.go
@@ -0,0 +1,5 @@
+package go_greeter
+
+func Greet(name string) string {
+	return "Hello, " + name
+}