First time user - Present accessibility features quick intro text

The first time you open the player, you could see the following in the center of the screen
```text
Hello from the creators of ClassTranscribe, here are some features that can help you learn-
[READ MORE] <*Space for text below but text is hidden until you click/hit return.;(*that's a display: css option.)

Upcoming assignment or exam? There's a caption-search field to search across all lecture videos.
English not your native language? Transcripts and closed captions are in other languages too.
A mistake in the captions? Click the caption to edit - this helps searches too.
Confused at minute 7? Create a shareable link to post in a forum or email.
Want a minimal interface? You can hide side-transcriptions and other distractions.
Hate using the mouse to rewind and pause? Check out the numerous shortcut keys.
Need a break on a long video? It remembers where you stopped.
Want XYZ...? Check out the settings.

We're building ClassTranscribe with better learning and accessibility features to help all students and students with diverse abilities - feel free to let us know how to improve it - classtranscribe@illinois.edu.
[CLOSE] [SEE MORE]
```
SEE MORE opens the current first item in the mini introduction help presenter
----
Upon close update the user metadata by adding a key ("SeenPlayerIntro") or set a cookie, so they don't see it again everytime they open the player. Pressing the topright '?' opens this slide again.
The above could be implemented as slide in the existing introduction tool.