add .clang-format

Change-Id: I7c2a527b4751a560703a61fcbe9638b150546af5
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/sample.cpp b/sample.cpp
index 451c6c4..72a120a 100644
--- a/sample.cpp
+++ b/sample.cpp
@@ -3,7 +3,7 @@
 int Factorial(int n)
 {
     int result = 1;
-    for (int i=1; i<=n; i++)
+    for (int i = 1; i <= n; i++)
     {
         result *= i;
     }