added links to wes' repositories. added user commands for linux.

LearnRedux/Learn-Redux-Starter-Files

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+Subproject commit 588a248f6450e14e4b31343ad2a848325730ca1d

Linux/admin.md

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 ## User management
 * Create regular user `$ `
 * Create system user `$ `
+* Add user to group `$ adduser <username> <group>`

ReactForBeginners/React-For-Beginners-Starter-Files

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+Subproject commit 567ff2f5203fa646267470b9e9fc7aac08e709a5