Add clang format file

Change-Id: Ia367554a3f1bbf1f03905e13b5360e83068ce2d8
diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..0927475
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,6 @@
+BasedOnStyle: Google
+IndentWidth: 4
+ColumnLimit: 100
+IncludeCategories:
+  - Regex: '^(<(gtest|gmock))'
+    Priority: -1
\ No newline at end of file