adds install script to readme (#201)
adds install script to readme (#201)

* adds install script to readme

* link to our install script code

tannerjfco/ddev,rfay/ddev,drud/ddev,drud/ddev,beeradb/ddev,cyberswat/ddev,cyberswat/ddev,rfay/ddev,drud/ddev,beeradb/ddev,drud/ddev,rfay/ddev,tannerjfco/ddev,drud/ddev,rfay/ddev,rfay/ddev