Update readme

readme.md

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 A Symfony console application to sync contacts from Planning Center to Google Groups. The application queries both sources for lists named after distribution groups. It then diffs the contacts and makes sure the Google group mirrors the contacts found in Planning Center.
 
 ## Installation
-All dependencies can be installed using Composer:
+All dependencies can be installed using the [Composer PHP dependency manager](https://getcomposer.org/). Once Composer is installed, [download this repository](https://github.com/nrutman/contacts-sync/releases) and run the following command:
 ```bash
 composer install
 ```