[README]: Add README

README.md

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+Challenges: (ranked roughly from easiest to hardest)
+ -  put user in a python shell, have them try to read the flag from a file
+ -  2l.sh - read flag from a file using only 2-letter shell commands
+ -  approved.pl - read flag from file using only the commands ls, pwd, whoami
+ -  patience.c - find the code from a binary executable that will print the solution in 1 year's time
+
+Make sure there is a different flag for each challenge.