Add shading/ directory to corpus

fx/shading/2_shading_type5_h.pdf

Index: fx/shading/2_shading_type5_h.pdf
diff --git a/fx/shading/2_shading_type5_h.pdf b/fx/shading/2_shading_type5_h.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..a97b3f6b35b85a674bea74340d79666b2d14c309
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+++ b/fx/shading/2_shading_type5_h.pdf
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