Add installing category

Author: GoldenVadim

installing/index.md

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+# Installing
+## Introduction
+This page is about installing NurOS to your physical or virtual device.
+## For x86 PCs
+The easiest devices to install NurOS are traditional x86 (Intel/AMD) computers. You can download latest bootable ISO image here. 
+These computers have UEFI or BIOS that can boot our ISO disk image. But you must write image to portable device such as USB memory stick, CD drive, etc.  
+**[ If you can't boot from your device, try to disable Secure Boot ]**  
+### Making bootable device
+To write ISO drive image you should use [Rufus](https://rufus.ie/) if you have Windows. Or if you have already other Linux/UNIX(-like) system, you should try 
+to use `dd`, for example you can use the command below:  
+```sh
+dd if=NurOS.iso of=/dev/sdb bs=4096 status=progress
+```