Add build files for submodules

submodule/src/BUILD

@@ -0,0 +1,9 @@
+load("@bazel_tools//tools/build_rules/go:def.bzl", "go_prefix", "go_library")
+
+go_prefix("github.com/laramiel/bazel-example-golang-bare/")
+
+go_library(
+    name = "bare",
+    srcs = [ "bare/bare.go" ],
+    visibility = ["//visibility:public"],
+)