Add README

Author: Greg Bowler

README.md

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+Command line tools for installing WebEngine.
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+One of the main notions of development within PHP.Gt is to remove any barriers that might prevent someone from productively building a prototype. This repository intends to remove all barriers by providing a single `gt` script that contains all of the setup commands to get you going on new and existing projects.
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+Note: this is a totally optional part of PHP.Gt/WebEngine. You can continue to set up WebEngine projects manually without losing any functionality.
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+PHP.Gt relies on Composer as the installation medium. Using Composer ensures you have the correct versions of PHP and extensions installed.
+
+With Composer installed, run `composer global require phpgt/installer` to globally install the interface required for creating new WebEngine applications. This will make the `gt` command available to your terminal, which includes the helper commands required for creating new projects and running them.
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+For the `gt` command to be available globally, ensure that your `~/.config/composer/vendor/bin` directory is in your PATH (or on Windows, `C:\%HOMEPATH%\AppData\Roaming\Composer\vendor\bin`).
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