Added contributing notes and roadmap to readme

README.md

@@ -2,3 +2,30 @@
 PHP Apprentice is a project for sharing knowledge about the PHP programming language.
 It is an online book that currently includes pages for learning the basics of PHP programming.
 PHP Apprentice is a work in progress so any constructive feedback is appreciated.
+
+## Contributing
+The codebase is a static site generator. It takes the Markdown files in the `chapters` folder
+and builds them with PHP templates in `assets/templates`. All of the setup is controlled from the
+`config.php` file. In `config.php`, the different chapters are ordered and template variables are placed.
+To make a change to a chapter, just edit the Markdown file and merge with `master` and Travis will automatically
+build the page again. Any page additions need to be included in the `config.php` file.
+
+### Running Locally
+To develop locally, clone the repository and run `composer install` and `npm install` in your terminal.
+Then, you can run `php apprentice build` to build all the pages and `php apprentice server` to start a
+development server on `localhost:8080`. The development server automatically rebuilds pages on load,
+so you can use it to easily view changes. To build the JavaScript and CSS, run `npm run build` or `npm run watch`.
+
+## Roadmap
+Moving forward, there are three sections I would like to add to the site:
+- Web
+- Database
+- Advanced
+
+The web section will outline the basics of HTTP, how to handle requests and response and generating HTML.
+
+The database section will cover PDO setup, fetching data and securely running queries.
+
+Advanced will hold deeper PHP topics like traits, closures, Composer, auto-loading and namespaces.
+
+If you would like to request a topic or see one section before another, feel free to open an issue.