notes.

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16/10/2020

 - questions raised by max (@notplants) as he contributes
   - rtc
     - why is a real-time clock needed? what does it do?
     - is there a recommened seller?
     - i see multiple variants of the module, which one should i get?
     + hobbytronics have discontinued the ds1338. the ds3231 looks like a solid alternative
       - requires slight change in configuration (/boot/firmware/config.txt : dtoverlay=i2c-rtc,ds3231)

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29/06/2020

 - todo: add styling conventions section
   - code comments: Capitalized first word and period at the end.

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