feat: Apache Mesos documentation

[sjyothi54]

Ticket: https://new-relic.atlassian.net/browse/NR-263265
Description: Created Integration documentation for Apache Mesos

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[github-actions]

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[homelessbirds]

Hi @sjyothi54! My colleague @bradleycamacho will be taking care of this one. Should be done by EOW :)