added sample Installation notes
updated wording for Installation
Updated as per Danielss89 

See https://github.com/ZF-Commons/ZfcUserDoctrineORM/pull/67/files#r11320378
wording clean up on README.md 

See https://github.com/ZF-Commons/ZfcUserDoctrineORM/pull/67/files#r11549005
Merge pull request #67 from dennis-fedco/patch-2

Added sample Installation Instructions for the module