Attention Handler design markdown

Added attention handler design document and enabled clang-format support. This design document is a work in progress and will continue to be updated as the attention handler design evolves.

Signed-off-by: Ben Tyner <ben.tyner@ibm.com>
Change-Id: Icdd33241f61a1b8691ed31c96cb065ebf08f3512
diff --git a/test/hello-world.cpp b/test/hello-world.cpp
index 8cc0b19..5cdaa1b 100644
--- a/test/hello-world.cpp
+++ b/test/hello-world.cpp
@@ -3,8 +3,7 @@
 
 int main()
 {
-    printf( "test: Hello, World!\n" );
+    printf("test: Hello, World!\n");
 
     return 0;
 }
-