Get ourselves some clang-format.

These are the same rules used by system/core/.  We'll apply it to
existing code in a future CL.

Test: none
Bug: 67041047
Change-Id: I407581a9ba155aea87ac87f231f5269f7c444a2e
diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..ae4a451
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,11 @@
+BasedOnStyle: Google
+AccessModifierOffset: -2
+AllowShortFunctionsOnASingleLine: Inline
+ColumnLimit: 100
+CommentPragmas: NOLINT:.*
+DerivePointerAlignment: false
+IndentWidth: 4
+PointerAlignment: Left
+TabWidth: 4
+UseTab: Never
+PenaltyExcessCharacter: 32