Added immutable oses' notes to the knowledge base

knowledge base/microos.md

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+# OpenSUSE MicroOS
+
+## TL;DR
+
+Every set of changes to the underlying system is executed on a new inactive snapshot, which will be the one the system will boot into on the next reboot.
+
+```shell
+# Upgrade the system.
+sudo transactional-update dup
+pkcon update
+
+# Install a package.
+sudo transactional-update pkg install tlp ntfs-3g fuse-exfat nano
+pkcon install gnu_parallel
+
+# Get a shell on the next snapshot.
+# Lets you use zypper.
+sudo transactional-update shell
+sudo tukit execute bash
+```
+
+## Setting up MicroOS as a desktop OS
+
+See [MicroOS Desktop] for more and updated information.
+
+## Sources
+
+- [MicroOS Desktop]
+
+[microos desktop]: https://opensuse.github.io/openSUSE-docs-revamped-temp/microos_getting_started/