add my usb problem

my-usb/description.md

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+I found my usb from a long time ago. I know there's a flag on there somewhere; can you help me find it?

my-usb/grader.py

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+def grade(autogen, answer):
+    if answer.find("d3let3d_f1l3z_r_k00l") != -1:
+        return { "correct": True, "message": "Correct!" }
+    return { "correct": False, "message": "Nope, try again." }

my-usb/problem.yml

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+title: My USB
+hint: Sorry, no hint.
+category: Forensics
+autogen: false
+programming: false
+value: 150
+files:
+  - usb.img
+