Updated README.md

Author: maguilar92

README.md

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+# Laravel Cross database subqueries
+Eloquent cross database compatibility in subqueries.
+
+# Why do I need it?
+### To use the following Eloquent methods cross databases:
+* has
+* whereHas
+* doesntHave 
+* whereDoesntHave
+* withCount
+
+# Installation
+Install with composer
+~~~
+composer require hoyvoy/laravel-cross-database-subqueries
+~~~
+
+From Laravel 5.5 onwards, it's possible to take advantage of auto-discovery of the service provider.
+For Laravel versions before 5.5, you must register the service provider in your config/app.php
+
+~~~
+Hoyvoy\CrossDatabase\CrossDatabaseServiceProvider::class,
+~~~