Add ParsedownHelper

ParsedownHelper.md

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+The `ParsedownHelper` template extension gives us a new tag to use in our templates.
+
+``` html
+<parsedown>{{ @variable | raw }}</parsedown>
+```
+
+This will resolve in the pre-compiled template file as 
+
+``` php
+<parsedown_rendered class="content">
+<?php echo \ParsedownHelper::instance()->build($variable);?>
+</parsedown_rendered>
+```
+
+Which ultimately calls
+` Parsedown::instance()->text($variable); `