Those files are sample to help you. Please refer to the
documentation included in sympa distribution or 
catch it on http://listes.cru.fr/sympa/direct/doc.html

robot.conf : sample virtual host configuration file

LDAP named filters :

employees.ldap is a named filter (should be located in ~sympa/etc/search_filters
send.employees is a sample scenario using the previous filter

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You should also have a look on src/scenari : the distribution
scenari can be used to create your own scenari in ~sympa/etc/scenari

Idem for src/templates