Update documentation to reflect copying required atlas file on solr installation

Currently, if solr is installed on a different machine other than Atlas the instructions to run the command to create solr vertices may not be valid.
The instructions currently mentions
Run the following commands from SOLR_HOME directory to create collections in Solr corresponding to the indexes that Atlas uses
bin/solr create -c vertex_index -d ATLAS_HOME/conf/solr -shards #numShards -replicationFactor #replicationFactor
bin/solr create -c edge_index -d ATLAS_HOME/conf/solr -shards #numShards -replicationFactor #replicationFactor
bin/solr create -c fulltext_index -d ATLAS_HOME/conf/solr -shards #numShards -replicationFactor #replicationFactor
We will have to update this with required files that required to be copied over to the solr server .