Update README.md

Author: elliotchance

README.md

@@ -1,7 +1,13 @@
 Xero API
 ========
 
-**This is the community official package since Xero is unwillign to add composer support or clean up the library.**
+[![Latest Stable Version](https://poser.pugx.org/elliotchance/xero-api/version.svg)](https://packagist.org/packages/elliotchance/xero-api)
+[![Total Downloads](https://poser.pugx.org/elliotchance/xero-api/downloads.svg)](https://packagist.org/packages/elliotchance/xero-api)
+[![License](https://poser.pugx.org/elliotchance/xero-api/license.svg)](https://packagist.org/packages/elliotchance/xero-api)
+
+**This is the community official package since Xero is unwilling to add composer support or clean up the library.** Please add existing pull requests and issues against this repository and we can all help fix it up :)
+
+Semantic versions have been created for existing releases and will be created here in the future.
 
 ### Installation