Userland: Introduce the lsblk utility to show list of storage devices

Base/usr/share/man/man8/lsblk.md

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+## Name
+
+lsblk - list connected storage devices
+
+## Synopsis
+
+```**sh
+$ lsblk
+```
+
+## Description
+
+lsblk is a utility for displaying information about storage devices in the system.
+It shows a brief list of these devices.
+
+## Files
+
+* `/sys/devices/storage` - source of the storage devices list.
+
+## Examples
+
+```sh
+$ lsblk
+```