Created FAQ (markdown)

FAQ.md

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+## FAQ
+
+`I added a command to the whitelist, but it's not displaying in tab completer!`
+
+Autocompleter will only display commands that are registered on the server. Make sure the command you added exists.
+
+`I don't want any tab completion!`
+
+You can either use permission plugin to deny _commandwhitelist.commands.default_ or remove all items from the default list and change the default line to 'default: []'
+
+`I can't use any commands I added to custom whitelist in config!`
+
+Use permission plugin to give yourself 'commandwhitelist.commands.<name_from_config>'