Add shading/ directory to corpus

fx/shading/2_shading_type_6_001.pdf

Index: fx/shading/2_shading_type_6_001.pdf
diff --git a/fx/shading/2_shading_type_6_001.pdf b/fx/shading/2_shading_type_6_001.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..76447d939c2e3fb5a90538c1ecd911eded552e3b
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