Update README

README.md

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 # silverstripe-canonical
 Adds a simple rel=canonical tag to Silverstripe 4
+
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/DorsetDigital/silverstripe-canonical/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/DorsetDigital/silverstripe-canonical/?branch=master)
+[![Build Status](https://scrutinizer-ci.com/g/DorsetDigital/silverstripe-canonical/badges/build.png?b=master)](https://scrutinizer-ci.com/g/DorsetDigital/silverstripe-canonical/build-status/master)
+[![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](LICENSE.md)
+[![Version](http://img.shields.io/packagist/v/dorsetdigital/silverstripe-canonical.svg?style=flat)](https://packagist.org/packages/dorsetdigital/silverstripe-canonical)
+
+# Requirements
+*Silverstripe 4.0.x
+
+# Installation
+* Install the code with `composer require dorsetdigital/silverstripe-canonical`
+* Run a `dev/build?flush` to update your project
+
+# Usage
+*This module adds a simple canonical tag to your pages to allow for the specification of the default domain.  
+The canonical tag allows you to signal to search engines like Google which is the authoritative version of the page to help reduce duplicate content issues caused by non-www versions, pages with different protocols, etc.
+
+Once installed, go to the site settings and enter the full canonical domain.   This should include the protocol (eg. http:// or https://) 
+
+
+At the time of writing, the canonical tags are only added correctly for pages in the SiteTree.   Pages generated from custom controllers or from DataObjects may or may not work!