Add .gitattributes to improve 'git diff' output

avikivity · avikivity · commit 47aff18df2d1 · 2015-11-03T11:37:48.000+02:00
diff --git a/.gitattributes b/.gitattributes
@@ -0,0 +1,2 @@
+*.cc diff=cpp
+*.hh diff=cpp
