Basic README.md for Vagrant

vagrant/README.md

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+Orchestrator Vagrant Instructions
+=================================
+
+Orchestrator's Vagrant defaults to installing five (5) CentOS 6.6 boxes in the following replication topology, with a separate "admin" node:
+
+db1<->db2
+ |     |
+ v     v
+db3   db4 
+
+It is possible to override what gets installed by the use of environmental variables:
+
+VAGRANT_SERVER_URL defaults to 'https://atlas.hashicorp.com'
+VAGRANT_DEFAULT_PROVIDER defaults to 'virtualbox'
+VAGRANT_BOX defaults to 'nrel/CentOS-6.6-x86_64
+
+The MySQL configuration is such that it is the minimum required to set up replication. For testing such features as delayed replication, RBR/SBR, GTID, it is simply a matter of editing the vagrant/dbX-my.cnf before running the `vagrant up` command.