Add shading/ directory to corpus

fx/shading/2_shading_type1_sc_.pdf

Index: fx/shading/2_shading_type1_sc_.pdf
diff --git a/fx/shading/2_shading_type1_sc_.pdf b/fx/shading/2_shading_type1_sc_.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..2994a1eaf16eaa66f2a0f1da5113cd585302f21f
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+++ b/fx/shading/2_shading_type1_sc_.pdf
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