Add README

Author: tomgud

README.md

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+# http-diff
+
+http-diff is command line tool for comparing http responses from two servers. 
+
+## Installation
+
+Installing `http-diff` in your project can be done with composer.
+
+`composer require tomgud/http-diff`
+
+You can also clone this repository and run `composer install` to install dependencies.
+
+## Requirements
+
+Version 0.1 runs on PHP 5.6 and will be the only version running on 5.6. The `http-diff` executable needs to be 
+placed in a sub, parent or the vendor folder to include the `autoload.php` file. 
+
+## Running
+
+You can define a specification of your suite of diffs in a json or yml file. Take a look into the examples/ folder,
+to get inspiration for your specification.