add a input for an example. I don't know how the testsuite could work without the file

.gitattributes

@@ -1428,6 +1428,7 @@ Convex_hull_2/benchmark/Convex_hull_2/static_ch2.cpp -text
 Convex_hull_2/demo/Convex_hull_2/help/index.html svneol=native#text/html
 Convex_hull_2/doc_tex/Convex_hull_2/convex_hull.png -text
 Convex_hull_2/doc_tex/Convex_hull_2/saarhull.png -text svneol=unset#image/png
+Convex_hull_2/examples/Convex_hull_2/iostream_convex_hull_2.cin -text
 Convex_hull_2/test/Convex_hull_2/ch2_projection_3.cpp -text
 Convex_hull_3/benchmark/Convex_hull_3/compare_different_approach.cpp -text
 Convex_hull_3/benchmark/Convex_hull_3/is_on_positive_side.cpp -text

Convex_hull_2/examples/Convex_hull_2/iostream_convex_hull_2.cin

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