Create approved-guest.md

Author: AndreaGriffiths11

admin/approved-guest.md

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+Dear Guest,
+
+Thank you for agreeing to join us on Open Source Friday! We're excited to have you share your project with our community.
+
+Your session will be hosted by Andrea Griffiths and/or Kedasha Kerr and will stream live on Twitch at 1 PM EST on your scheduled Friday. To get you set up:
+
+1. Please select an upcoming Friday from our streaming calendar: [calendar link](https://gh.io/osf-booking)
+
+2. After selecting your date, please open an issue titled:
+   "Open Source Friday - [Your Project Name] - [DD-MM-YYYY]".
+   using our guest template at this [issue link](https://gh.io/osf-issue).
+
+Once both steps are completed, we'll send you additional details about the stream setup and what to expect.
+
+Looking forward to having you on the show!
+
+With gratitude,
+
+Andrea and Kedasha