Populate edgerouter description docs

docs/hardware/erl.md

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+# Ubiquiti EdgeRouter Lite
+
+**Quick Links:**
+* [Official spec sheet](https://dl.ubnt.com/datasheets/edgemax/EdgeRouter_DS.pdf)
+* [Software/firmware downloads](https://www.ui.com/download/edgemax/edgerouter-lite)
+* ["Which EdgeRouter Should I Use?"](https://help.ubnt.com/hc/en-us/articles/219652227--EdgeRouter-Which-EdgeRouter-Should-I-Use-)
+
+![EdgeRouter Lite](../img/erl.jpg)
+
+Ubiquiti's EdgeMax platform is the closest thing you can get to an enterprise
+grade router for less than $200. I bought my EdgeRouter Lite (ERL) for my first
+apartment almost five years ago and I have never once regretted my decision.
+The only time I've ever thought about giving it up was when I briefly thought
+about buying a bigger EdgeRouter.
+
+The EdgeMax/EdgeRouter operating system, creatively named EdgeOS, is a fork of
+the open source [VyOS](https://vyos.io/) and is loaded with excellent features
+and a killer web UI.
+
+The ERL is fanless and sports three gigabit ethernet ports, as well as a
+dedicated serial console port for when I inevitably lock myself out.
+
+It's also rackmountable:
+* [EdgeRouter Lite rackmount kit](http://www.ispsupplies.com/categories/Indoor-Enclosures/KAM-Fab-UB-RM1.html)
+
+
+---
+
+*Last updated `{{ git_revision_date }}`*