add flag collection

flag-collection/description.md

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+Here's a collection of flags! I think you're looking for a specific one, though...

flag-collection/grader.py

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+def grade(autogen, answer):
+    if answer.find("thumbs.db_c4n_b3_useful") != -1:
+        return True, "wowie! thumbs up"
+    return False, "Nope, try again."

flag-collection/problem.yml

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+title: Flag Collection
+author: neptunia
+hint: Looking through all these files must be a pain...
+category: Forensics
+autogen: false
+programming: false
+value: 80
+files:
+  - flags.zip
+