Add color/ directory from foxit to test case repository

fx/color/color_separation.pdf

Index: fx/color/color_separation.pdf
diff --git a/fx/color/color_separation.pdf b/fx/color/color_separation.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..275937574192b3fab9dd27ea1356f82bb264ba61
--- /dev/null
+++ b/fx/color/color_separation.pdf
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