Add a link of pytorch/xla tutorial video to the contribution page.

[iwknow]

Add a link of pytorch/xla tutorial video to the contribution page. the videos may help for the contributors.

[iwknow]

i made a series of videos talking about how pytorch/xla works under the hood. specifically, it demonstrates the computation graph tracing, compiling and executing details. i feel it will be useful for learners and contributors like me. i add a link to the videos hoping they will help more contributors like me. @ysiraichi @zhanyong-wan feel free to change the assignee if you feel there is other people more suitable for the review. thanks!

[zhanyong-wan]

Great! Thanks for contributing!

[iwknow]

@zhanyong-wan the tests has been pending since yesterday. is there a shortage of tpu test runners or is there a misconfiguration?

[zhanyong-wan]

@pytorchbot merge -f

[pytorch-bot]

❌ 🤖 pytorchbot command failed:

@pytorchbot merge: error: argument -f/--force: expected one argument

usage: @pytorchbot merge [-f MESSAGE | -i] [-ic] [-r [{viable/strict,main}]]

Try @pytorchbot --help for more info.

[zhanyong-wan]

@pytorchbot merge -f "CI issue unrelated to PR"

[pytorch-bot]

Mergebot is not configured for this repository. Please use the merge button provided by GitHub.

[zhanyong-wan]

I force merged this. We can look into the CI issue if it happens again.