Added docs.

Author: devdrops

docs.md

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+##PHP DocBlock Checker
+
+A basic CLI (Command Line Interface) tool to verify if your PHP classes have DocBlocks.
+
+###How to install?
+
+**PRE NOTE**: you should have [Composer](https://getcomposer.org/) installed before proceed on these next steps.
+
+1. Run `git clone https://github.com/devdrops/php-docblock-checker.git` on your terminal;
+2. Once you've entered the project root folder, run `composer install`;
+3. And now you're ready to go! :D
+
+###How to use?
+
+1. Once everything is correctly installed, run `php phpdoccheck -d /full/path/to/your/selection/`. **Remember** that the *-d* flag is required!
+2. Then, check the input to fix any fail.