Added RTC Instructions

Just adding image and article, letting @lorforlinux set index etc.

@jkridner @RobertCNelson In case you don't get pinged too, I can't assign reviewers.

mentioned in commit jkridner/docs@8a260106

mentioned in commit jkridner/docs@12aa9693

Sure, but I wouldn't really call it a demo... it's a board feature.

@andrei1998 Please also pull @jkridner's commits as well.

1. jkridner/docs@8a260106
2. jkridner/docs@12aa9693

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• 55d9282e - You're right, got that wrong.

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• 00d3cc82 - Apply 1 suggestion(s) to 1 file(s)

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mentioned in commit andrei1998/docs-beagleboard-io-rtc@055246a3

mentioned in commit andrei1998/docs-beagleboard-io-rtc@e2ea88cf

added 2 commits

• e2ea88cf - Add using-rtc to ToC
• 055246a3 - Using RTC review items

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@lorforlinux added Jason's commits too, should be good to merge.

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• 055246a3...4ae108e7 - 2 commits from branch docs:main
• 03105dee - Merge branch 'main' of https://openbeagle.org/docs/docs.beagleboard.io

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@andrei1998 Please resolve the threads and I'll merge this. For more information on using git, you can check our git usage guide here: https://docs.beagleboard.io/latest/intro/contribution/git-usage.html

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• 226f0133 - Apply 1 suggestion(s) to 1 file(s)

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This should also help, https://code.visualstudio.com/docs/sourcecontrol/intro-to-git