Added Serial forensics problem

serial/description.md

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+I was listening to [this](${serial_wav}) haystack, but I didn't notice anything. What did I miss?

serial/grader.py

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+def grade(random, key):
+    if key.find("easyctf{s3r1Al_F0rMat5_R_GreAT}") != -1:
+        return True, "01000011 01101111 01110010 01110010 01100101 01100011 01110100 00100001" #"Correct!".toBin()
+    return False, "Nope."

serial/problem.yml

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+title: Serial
+category: Forensics
+value: 300
+hint: 010100110110010101110010011010010110000101101100001011100010111000101110
+author: wiresboy
+autogen: true