add a challenge

checks/challenge-1

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+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: RIPEMD160
+
+I promise to delivery 8 bottles of "Füchschen" to the first one who tells me
+the plaintext of the following message or is able to forge the signature
+on this file.  Don't try to get my secret key, it does not exist any longer.
+For those who don't know:  Füchschen is a beer brewed here in Düsseldorf.
+This promise is valid for 2 years from now (29.5.1998).
+
+
+Good luck,
+
+   Werner
+
+
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