Added adding kernel parameters to docs

docs/os/configuration/adding-kernel-parameters/index.md

@@ -0,0 +1,28 @@
+---
+title: Adding kernel parameters
+layout: os-default
+
+---
+
+## Kernel parameters
+
+There are two ways to edit the kernel parameters, in-place (editing the file and reboot) or during installation to disk.
+
+### In-place editing
+
+For in-place editing, you will need to run a container with an editor and a mount to access the `/boot/global.cfg` file containing the kernel parameters.
+
+> To activate this setting, you will need to reboot.
+
+```bash
+$ sudo system-docker run --rm -it -v /:/host alpine vi /host/boot/global.cfg
+```
+
+
+### During installation
+
+If you want to set the extra kernel parameters when you are [Installing RancherOS to Disk]({{site.baseurl}}/os/running-rancheros/server/install-to-disk/) please use the `--append` parameter.
+
+```bash
+$ sudo ros install -d /dev/sda --append "rancheros.autologin=tty1"
+```