Added Joomla CLI Cheatsheet

Joomla-CLI-CheatSheet.md

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+# CLI Cheatsheet
+
+## Cache 
+```
+cache:clean 	Clean expired cache entries
+```
+
+## Config 
+```
+config:get 	Display the current value of a configuration option
+config:set 	Set a value for a configuration option
+```
+
+## Core 
+```
+core:check-updates 	Check for Joomla updates
+core:update 	Update Joomla
+```
+
+## Database 
+```
+database:export 	database:export
+database:import 	Import the database
+```
+
+## Extension 
+```
+extension:discover 	Discover extensions
+extension:discover:install 	Install discovered extensions
+extension:discover:list 	List discovered extensions
+extension:install 	Install an extension from a URL or from a path
+extension:list 	List installed extensions
+extension:remove 	Remove an extension
+```
+
+## Finder 
+```
+finder:index 	Purges and rebuild the index
+Scheduler 
+scheduler:list 	List all scheduled tasks
+scheduler:run 	Run one or more scheduled tasks
+scheduler:state 	Enable, disable or trash a scheduled task
+```
+
+## Session 
+```
+session:gc 	Perform session garbage collection
+session:metadata:gc 	Perform session metadata garbage collection
+```
+
+## Site 
+```
+site:down 	Put the site into offline mode
+site:up 	Put the site into online mode
+```
+
+## Update 
+```
+update:extensions:check 	Check for pending extension updates
+update:joomla:remove-old-files 	Remove old system files
+```
+
+## User 
+```
+user:add 	Add a user
+user:addtogroup 	Add a user to a group
+user:delete 	Delete a user
+user:list 	List all users
+user:removefromgroup 	Remove a user from a group
+user:reset-password 	Change a user's password
+```
+
+## References
+
+* [Joomla Magazine - Powerful cli](https://magazine.joomla.org/all-issues/june-2022/joomla-4-a-powerful-cli-application)