doc: add CrOS install guide

doc/self-hosted/cros-install.md

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+# Installng code-server in your ChromiumOS/ChromeOS/CloudReady machine
+
+This guide will show you how to install code-server into your CrOS machine.
+
+Before everything else, you are required to turn on developer mode for your machine, but for ChromiumOS and CloudReady users (Home Edition), this is done for you.
+
+## Using Crostini
+
+One of the easier ways to run code-server is via Crostini, the Linux apps support feature in CrOS. Make sure you have enough RAM, HDD space and your CPU has VT-x/ AMD-V support. If your chromebook has this, then you are qualified to use Crostini.
+
+If you are running R69, you might want to enable this on [Chrome Flags](chrome://flags/#enable-experimental-crostini-ui). If you run R72, however, this is already enabled for you.
+
+After checking your prerequisites, follow the steps in the [the install guide](index.md) on installing code-server. Once done, make sure code-server works by running it.
+
+After confirming it runs, head over to `crosh`, the native terminal for your Chromebook. Reiterating, you must have developer mode enabled to be able to enter `crosh`.
+
+Once in `crosh`, type `vsh termina`. It should drop you to the Termina's shell.
+
+```bash
+Loading extra module: /usr/share/crosh/dev.d/50-crosh.sh
+Welcome to crosh, the Chrome OS developer shell.
+
+If you got here by mistake, don't panic!  Just close this tab and carry on.
+
+Type 'help' for a list of commands.
+
+If you want to customize the look/behavior, you can use the options page.
+Load it by using the Ctrl+Shift+P keyboard shortcut.
+
+crosh> vsh termina
+(termina) chronos@localhost ~ $
+```
+Now, while in termina, run `lxc list`. It should render you this output.
+
+```bash
+(termina) chronos@localhost ~ $ lxc list
++---------+---------+-----------------------+------+------------+-----------+
+|  NAME   |  STATE  |         IPV4          | IPV6 |    TYPE    | SNAPSHOTS |
++---------+---------+-----------------------+------+------------+-----------+
+| penguin | RUNNING | 100.115.92.199 (eth0) |      | PERSISTENT | 0         |
++---------+---------+-----------------------+------+------------+-----------+
+(termina) chronos@localhost ~ $ 
+```
+
+Crostini has IPv4 outbound networking so that means, it is bound to `eth0` in this case. Take note of the IP, then simply go to `<penguin IP>:8443` to access code-server. Now you should be greeted with this screen. If you did, congratulations, you have installed code-server in your Chromebook!
+
+![code-server on Chromebook](../assets/cros.png)
+
+## Using Crouton
+
+Crouton is one of the old ways to get a running full Linux via `chroot` on a Chromebook. Like so, enable developer mode, and go to `crosh`. This time, run `shell`, which should drop you to `bash`.
+
+Make sure you downloaded `crouton`, if so, go ahead and run it under `~/Downloads`. After installing your chroot container via crouton, go ahead and enter `enter-chroot` to enter your container.
+
+Follow the instructions set in [the install guide](index.md) to install code-server. After that is done, run `code-server` and verify it works by going to `localhost:8443`.
+
+> At this point in writing, `localhost` seems to work in this method. However, the author is not sure if it applies still to newer Chromebooks.