Add shading/ directory to corpus

fx/shading/2_shading_type_6_00.pdf

Index: fx/shading/2_shading_type_6_00.pdf
diff --git a/fx/shading/2_shading_type_6_00.pdf b/fx/shading/2_shading_type_6_00.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..e881c12f99859f2dda255bbe990d5d6159363787
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+++ b/fx/shading/2_shading_type_6_00.pdf
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