Add .clang-format file.

Not going to format the whole world just yet, but this helps for `git
clang-format`.

Change-Id: I482819419647e4c752d3b044bde8d637e1fae1e5
diff --git a/adb/.clang-format b/adb/.clang-format
new file mode 100644
index 0000000..2b83a1f
--- /dev/null
+++ b/adb/.clang-format
@@ -0,0 +1,11 @@
+BasedOnStyle: Google
+AllowShortBlocksOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+
+CommentPragmas: NOLINT:.*
+DerivePointerAlignment: false
+IndentWidth: 2
+PointerAlignment: Left
+TabWidth: 2
+UseTab: Never
+PenaltyExcessCharacter: 32