Add profiles documentation template

doc/profiles.md

+# Batsim Job Profiles
+
+In order to know what has to be simulated for each job of a workload, Batsim is using the notion of job profile.
+
+Each job is associated to a profile, but a profile can be associated to multiple jobs.
+
+Here is a list of all the profiles supported by Batsim, with an explaination on how they work and how to use it:
+
+## `delay`
+
+TODO
+
+## TODO
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