Add FairRank.cpp

Add FairRank.cpp created by @emilk a couple of years ago when we wanted a
ranking system for our small squash competition.

Compilation: clang++ FairRank.cpp

Usage: create a file called results in the directory data/

Example:
$ cat data/results
foo bar 5-0
foo bar 9-0
foo baz 3-8
foo baz 3-7

Run the FairRank program which will generate a file data/stats which will
contain the ranking.

Signed-off-by: anton <haglundanton+github@gmail.com>