tutorial: add pretendo

This currently links to the wiki. Currently the official website's
instructions are largely out of date and confusing for our users.

In the future it should be switched back to the official website.

cogs/assistance-cmds/tutorial/pretendo.all.md

@@ -0,0 +1,9 @@
+---
+title: Pretendo
+url: https://wiki.hacks.guide/wiki/Pretendo_Network
+author.name: Wiki Contributors
+thumbnail-url: https://nintendohomebrew.com/assets/img/nhmemes/bigh.png
+help-desc: Pretendo Setup Guide
+---
+
+Information and installation steps for the Pretendo Network