Adds readme

Author: ajaaleixo

README.MD

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+# Laravel Correlation ID Middleware
+Supports L5.5+
+
+This package offers you a way of adding a correlation id output on Laravel Logger based on a sent Header.
+Inspired by [this repo](https://github.com/proemergotech/correlate-php-laravel) it has:
+
+- all the functionality to set macros on a Request and Push a Monolog Processor
+- adds a configuration file to override settings
+- adds proper tests
+- enables usage for recent Laravel versions (5.5+)
+
+## Install
+
+### Add Service provider
+Open your config/app.php and insert the following in providers key:
+```
+Ajaaleixo\Middleware\CorrelationId\CorrelationIdServiceProvider::class,
+```
+
+### Run Publish command
+```
+php artisan vendor:publish --provider="Ajaaleixo\Middleware\CorrelationId\CorrelationIdServiceProvider"
+```
+
+### Edit your settings
+Open ```config/correlationid.php```.
+
+## Roadmap
+TODO
+
+