Add optional maven configuration info
Add optional maven configuration info

Related to: https://jira.duraspace.org/browse/FCREPO-1452

yinlinchen/fcrepo-camel-toolbox,fcrepo4-exts/fcrepo-camel-toolbox,whikloj/fcrepo-camel-toolbox,fcrepo4-labs/fcrepo-camel-toolbox,bseeger/fcrepo-camel-toolbox,awoods/fcrepo-camel-toolbox,mohideen/fcrepo-camel-toolbox,daniel-dgi/fcrepo-camel-toolbox,whikloj/fcrepo-camel-toolbox,mohideen/fcrepo-camel-toolbox,yinlinchen/fcrepo-camel-toolbox,fcrepo4-labs/fcrepo-camel-toolbox,bseeger/fcrepo-camel-toolbox,daniel-dgi/fcrepo-camel-toolbox,fcrepo4-exts/fcrepo-camel-toolbox