Add Tutorials in SpeechBrain repository

[Adel-Moumen]

What does this PR do?

This pull request adds tutorials inside the SpeechBrain repository. Indeed, our tutorials can be hard to find if a user is not aware of our website. Most people start their SpeechBrain journey through our GitHub page, and having a tutorials folder will undoubtedly help them get a better grasp of what SpeechBrain is.

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[pplantinga]

Great PR, perhaps we can add some basic instructions for how to run one of the notebooks in Google Colab, something like this? https://saturncloud.io/blog/how-can-i-run-notebooks-of-a-github-project-in-google-colab/

Maybe in like a readme in the tutorials folder

[mravanelli]

According to what I see, it seems there are some critical aspect. Firstly, when users click on the tutorial while navigating in the repository, Google Colab doesn't start, preventing users from running the code. I suspect this issue might also occur on the website if the link doesn't lead directly to Google Colab.

[pplantinga]

According to what I see, it seems there are some critical aspect. Firstly, when users click on the tutorial while navigating in the repository, Google Colab doesn't start, preventing users from running the code. I suspect this issue might also occur on the website if the link doesn't lead directly to Google Colab.

There's two things we can do that should mitigate this:

1. In the website, we can add links directly to colab of our github notebooks. This would be of the format:
   https://colab.research.google.com/github/Adel-Moumen/speechbrain/blob/add_tutorials/tutorials/ASRfromScratch.ipynb
2. For users navigating the repo, we could add links of the same format in the readme directly

[pplantinga]

We can probably even auto populate and check the links in the readme using a commit hook