adding api.Externalable example, with Approve/AutoApprove and hooks

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+# Externalable
+
+This example shows how to enable outside clients to submit content to your CMS.
+All content submitted must be done through a POST request encoded as `multipart/form-data`
+
+## Song example
+Imagine an app that lets users add Spotif music to a global playlist, and you need them
+to supply songs in the format:
+```go
+type Song struct {
+	item.Item
+
+	Title      string `json:"title"`
+	Artist     string `json:"artist"`
+	Rating     int    `json:"rating"`
+	Opinion    string `json:"opinion"`
+	SpotifyURL string `json:"spotify_url"`
+}
+```
+
+See the file `content/song.go` and read the comments to understand the various
+methods needed to satify required interfaces for this kind of activity.
+
+### Overview
+1. Implement `api.Externalable` with the `Accept(http.ResponseWriter, *http.Request)` method to allow outside POST requests
+2. Implement `editor.Mergeable` with the `Approve(http.ResponseWriter, *http.Request)` method so you can control the Approval / Rejection of submitted content OR
+3. Implement `api.Trustable`  with the `AutoApprove(http.ResponseWriter, *http.Request)` method to bypass `Approve` and auto-approve and publish submitted content
+
+There are various validation and request checks shown in this example as well. 
+Please feel free to modify and submit a PR for updates or bug fixes!
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