Add folder and config for preupload hooks.

Folder for custom preupload hooks and a copy of global hooks config.

Change-Id: I0c70f85d24d9e518770ea5b0242af722ae0d4b84

preupload-hooks/GLOBAL-PREUPLOAD.cfg

diff --git a/preupload-hooks/GLOBAL-PREUPLOAD.cfg b/preupload-hooks/GLOBAL-PREUPLOAD.cfg
new file mode 100644
index 0000000..b87fdec
--- /dev/null
+++ b/preupload-hooks/GLOBAL-PREUPLOAD.cfg
@@ -0,0 +1,13 @@
+# Global `repo upload` hook settings.
+# https://android.googlesource.com/platform/tools/repohooks
+
+[Options]
+ignore_merged_commits = true
+
+[Builtin Hooks]
+pylint3 = true
+cpplint = true
+clang_format = true
+
+[Builtin Hooks Options]
+clang_format = --commit ${PREUPLOAD_COMMIT} --style file --extensions c,h,cc,cpp