add plugin-dev content

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# Basics
Creating your own content for Pico is *easy*.
Coming soon!
Inside the root Pico folder, all *themes* reside in the `themes` directory,
and all *plugins* in the `plugins` directory. (As a developer, you may have
changed these paths and/or directory names when you initialized Pico.)

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core:
_title: Core
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#Pico Core
It's generally not a good idea to make modifications to the core of Pico. If you
are looking to add or change functionality, can it be accomplished with a plugin?
If not, and you are interested in helping to develop the Pico core, [fork us on GitHub](https://github.com/picocms/Pico)!

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toc:
plugins:
_title: Plugins
migrating: Migrating 0.X -> 1.0
your_first: Your First Plugin
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#Plugins
At the heart of customizing Pico is a plugin. You can 'hook-in' to the Pico
engine at many different times during the rendering of your site and its content.
You will find a full example template in `plugins/DummyPlugin.php` to get you
started on building some great stuff. Otherwise, keep reading to learn how to
create your first plugin!
Officially tested plugins can be found at http://pico.dev7studios.com/plugins,
but there are many awesome third-party plugins out there! A good start point
for discovery is our [Wiki](#plugin-wiki).
#Migrating from 0.X -> 1.0
The new event system supports plugin dependencies as well as some new events.
You will be able to set an enabled/disabled state by default as well. If you
have previously cerated a plugin for Pico, it is *HIGHLY* recommended that you
update your class to extend from `AbstractPicoPlugin` and use the new events
to avoid activating the `PicoDeprecated` plugin.
|---------------------|-----------------------------------------------------------|
| Event | ... triggers the deprecated event |
|---------------------|-----------------------------------------------------------|
| onPluginsLoaded | plugins_loaded() |
| onConfigLoaded | config_loaded($config) |
| onRequestUrl | request_url($url) |
| onContentLoading | before_load_content($file) |
| onContentLoaded | after_load_content($file, $rawContent) |
| on404ContentLoading | before_404_load_content($file) |
| on404ContentLoaded | after_404_load_content($file, $rawContent) |
| onMetaHeaders | before_read_file_meta($headers) |
| onMetaParsed | file_meta($meta) |
| onContentParsing | before_parse_content($rawContent) |
| onContentParsed | after_parse_content($content) |
| onContentParsed | content_parsed($content) |
| onSinglePageLoaded | get_page_data($pages, $meta) |
| onPagesLoaded | get_pages($pages, $currentPage, $previousPage, $nextPage) |
| onTwigRegistration | before_twig_register() |
| onPageRendering | before_render($twigVariables, $twig, $templateName) |
| onPageRendered | after_render($output) |
|---------------------|-----------------------------------------------------------|
#Your First Plugin
## 1. To get started, navigate to your `plugins` directory
![Step1](style/images/docs/pico_plugins.jpg)
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## 2. Create a new folder and name it your desired name using CammelCase
![Step2](style/images/docs/pico_plugins_myplugin.jpg)
> *Note:* It's not necessary to create the folder, if you do not have assets to
> include, you can simply skip this step and continue to Step 3
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## 3. Next, you should copy `DummyPlugin.php` inside your newly created folder and give it the same name as you did the folder
![Step3](style/images/docs/pico_plugins_myplugin_php.jpg)
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## 4. You will need to name the `class` the same as the `folder` and the `.php` file
![Step4](style/images/docs/pico_plugins_myplugin_php_class.jpg)
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## 5. From here, you will be able to hook-in to Pico's processing
Choose an event that makes sense for your situation. Do you need to load configuration values?
`onConfigLoaded`. You need to modify the content of the page before it is
rendered by markdown? `onPageRendering`. Etc... Plugin developers shouldn't
manipulate data in "wrong" events, this could lead to unexpected behavior.
> *Note:* Don't forget to set your plugins enabled/disabled state, either by default or
> through your sites `config/config.php` file.
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wiki: Wiki
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#Plugin Wiki
Whether you have an awesome new plugin you've created and you're dying to share,
or if you're a new plugin developer and you're looking for some inspiration--
our [Pico Plugin Wiki](https://github.com/picocms/Pico/wiki/Pico-Plugins) is here to help!