~anjan/err-remind

fixed timezone issue
fixed plugin not working in group chats
seperate functions for storing reminders
fix send_reminder with safest check for self["REMINDER_IDS"]
fixed tryexcept in send_reminder to be safer
Fixed self["REMINDER_IDS"] did not exist at startup
added readme
added license
Added sending reminders at correct time with polling
added persistent saving of reminders
wrote user interaction to add reminder
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