Notify first-time users how to initialize plugin

[Infinitay]

It would be helpful to notify users on their first install/run of the plugin on how to proceed with using it properly. Basically, just telling them to check their pouches and to (attempt to) repair them in the chat.

Potential Implementation:

• Check if tracking state config is null -> First time plugin run for the current player
  • Could be annoying because what if a player never bothers to check it and they just keep restarting their session?
    • Just do it on first install and if config is null I guess Although, hopefully this isn't all too necessary considering the overlays on the pouches will be enough.

[Infinitay]

For now I included basic instructions in the README. Although, TBF after the pouch checking additions and support, I think it's obvious how to initialize/use the plugin. After all, the vanilla Essence Pouch plugin made by Adam doesn't give instructions either.

Currently considering

• Scraping this change entirely because it's really not necessary
• Whether or not to change the "repair" remaining essence until decay to be a "?" instead. Would be in line with the stored essence when the state is unknown, and it won't be all too confusing
  • Although if it's a "?" they won't the user could not know what to do. Having the label as repair seems like a better option.

[Infinitay]

After #32 I'm considering the following changes:

1. Add a chat message on first install to tell users to first check and repair their pouches
2. Don't update the stored essence count until they check their pouch Completed as of #37
   • Show stored count as "?", don't update the count, leave unknownStored as false, re-update when checked
   • Show stored count as "?", update the count, leave unknownStored as false, re-update when checked