added autoencoders tutorial

[Shayan-B]

Added Autoencoders

Description

Added Autoencoders tutorial in basic section and updated the index.rst

cc @subramen @albanD @jbschlosser

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2992

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❌ 1 New Failure

As of commit 05e8fb2 with merge base f1c0b8a ():

NEW FAILURE - The following job has failed:

• Check spelling / pyspelling (gh)
  Process completed with exit code 1.

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