Added Monthly Reminders Notice

MonthlyNotice.md

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+Monthly Reminder: The admins are here to help. Please feel free to contact any of us via direct message for slack admin assistance or if urgent simply `@admin` in the channel when required.  
+​
+Admins:
+`@adamcodega`, `@carrienz`, `@ccoy`, `@dana`, `@dials-mavis`, `@emily`, `@grahamgilbert`, `@kitzy`, `@macmule`, `@marcusransom`, `@mrowell`, `@neilmartin83`, `@quovadimus`, `@rtrouton`
+​
+Code of Conduct:
+https://github.com/macadminsdotorg/codeofconduct