TODO: Add information about Linux Users and Groups

[zweilosec]

TODO: Add information about Linux Users and Groups;

• Add information about creating, modifying, and deleting users and passwords
• Add information about use, creation, modification, and deletion of groups
• Add commands such as adduser, groups, passwd, etc.
• Add commands related to listing users, seeing who is logged in, etc. (id, w, last -a)
• add descriptions and examples

• https://github.com/zweilosec/Infosec-Notes/blob/master/linux-1/linux-basics.md#users-and-groups