added petty-difference

petty-difference/description.md

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+I found two files in a secret room. They look like jumbled letters with no patterns. I mean look at it! [file1](${file1_txt}) is identical to [file2](${file2_txt}), right?

petty-difference/grader.py

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+def grade(random, key):
+        if key.find("th1s_m4y_b3_th3_d1ff3r3nc3_y0u_w3r3_l00k1ng_4") != -1:
+                return True, "You got it! Great Job!"
+        return False, "No."

petty-difference/problem.yml

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+title: Petty Difference
+author: dududum561
+hint: No hint
+category: Forensics
+autogen: false
+programming: false
+value: 50
+files:
+  - file1.txt
+  - file2.txt