Stub docs for Installing Plugins

docs/source/04-02-installing-plugins.md

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+---
+title: Plugins Overview
+permalink: /plugins/
+---
+
+There are several ways to install plugins.
+
+### Default Plugins vs. Custom Plugins
+
+Talk ships with a default set of plugins, available in `plugins.default.json`. When you run Talk with just the default plugins, these are the plugins that will be enabled.
+
+If you want to use the additional plugins that are available, you can create a `plugins.json` file. If this file exists, Talk will use that to determine which plugins to use.
+
+### Installing a Plugin from npm
+
+
+If you create your own plugin, you can publish the plugin to npm and use it in Talk. The npm package can be public (open source) or private.
+
+You would include this in your `plugins.json`:
+
+EXAMPLE HERE
+
+### Installing a Local Plugin
+
+If you host your own plugin on Github, you can enable it by adding this to your `plugins.json`:
+
+EXAMPLE HERE
+
+### Best Practice
+
+
+