add .clang-format

Change-Id: I6627b5569c2e0f730be7331403218b823a2c622f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/notimpl/readonly.hpp b/notimpl/readonly.hpp
index a609e22..2929b75 100644
--- a/notimpl/readonly.hpp
+++ b/notimpl/readonly.hpp
@@ -4,23 +4,22 @@
 
 #include "interfaces.hpp"
 
-
-class ReadOnly: public WriteInterface
+class ReadOnly : public WriteInterface
 {
-    public:
-        ReadOnly()
-            : WriteInterface(0, 0)
-        { }
+  public:
+    ReadOnly() : WriteInterface(0, 0)
+    {
+    }
 
-        void write(double value) override;
+    void write(double value) override;
 };
 
-class ReadOnlyNoExcept: public WriteInterface
+class ReadOnlyNoExcept : public WriteInterface
 {
-    public:
-        ReadOnlyNoExcept()
-            : WriteInterface(0, 0)
-        { }
+  public:
+    ReadOnlyNoExcept() : WriteInterface(0, 0)
+    {
+    }
 
-        void write(double value) override;
+    void write(double value) override;
 };