Add an example using glog from Bazel

bazel/example/BUILD

+cc_test(
+    name = "main",
+    size = "small",
+    srcs = ["main.cc"],
+    deps = [
+        "//:glog",
+    ],
+)

bazel/example/main.cc

+#include <gflags/gflags.h>
+#include <glog/logging.h>
+
+int main(int argc, char* argv[]) {
+  // Initialize Google's logging library.
+  google::InitGoogleLogging(argv[0]);
+
+  // Optional: parse command line flags
+  gflags::ParseCommandLineFlags(&argc, &argv, true);
+
+  LOG(INFO) << "Hello, world!";
+
+  return 0;
+}