Add logo (#2802)

Summary:
* Add the new official torchaudio logo to documentation/README.
* Add a page for download logo.

https://output.circle-artifacts.com/output/job/e9eb1292-7c10-4fef-adc3-ad568802aa59/artifacts/0/docs/index.html

<img width="1068" alt="Screen Shot 2022-11-14 at 10 30 27 AM" src="https://user-images.githubusercontent.com/855818/201738349-9e248f15-dce2-4931-9066-aa898a53d6ad.png">

https://output.circle-artifacts.com/output/job/e9eb1292-7c10-4fef-adc3-ad568802aa59/artifacts/0/docs/logo.html

<img width="617" alt="Screen Shot 2022-11-14 at 10 30 47 AM" src="https://user-images.githubusercontent.com/855818/201738420-ad0fda2f-f310-4802-851c-bbdf6c84c045.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2802

Reviewed By: carolineechen

Differential Revision: D41295277

Pulled By: mthrok

fbshipit-source-id: 6615d00799c9611f875e8485459d800e350b3486

README.md

@@ -6,6 +6,8 @@ torchaudio: an audio library for PyTorch
 [![Anaconda Badge](https://anaconda.org/pytorch/torchaudio/badges/downloads.svg)](https://anaconda.org/pytorch/torchaudio)
 [![Anaconda-Server Badge](https://anaconda.org/pytorch/torchaudio/badges/platforms.svg)](https://anaconda.org/pytorch/torchaudio)
 
+![TorchAudio Logo](docs/source/_static/img/logo.png)
+
 The aim of torchaudio is to apply [PyTorch](https://github.com/pytorch/pytorch) to
 the audio domain. By supporting PyTorch, torchaudio follows the same philosophy
 of providing strong GPU acceleration, having a focus on trainable features through

docs/source/index.rst

 Torchaudio Documentation
 ========================
 
+.. image:: _static/img/logo.png
+
 Torchaudio is a library for audio and signal processing with PyTorch.
 It provides I/O, signal and data processing functions, datasets,
 model implementations and application components.
@@ -17,6 +19,7 @@ model implementations and application components.
    Index <self>
    supported_features
    feature_classifications
+   logo
    references
 
 .. toctree::

docs/source/logo.rst

+TorchAudio Logo
+===============
+
+If you make your project using TorchAudio and you want to mention TorchAudio, you can use TorchAudio logo. There are couple of variations. You can download them from `here <https://download.pytorch.org/torchaudio/logo/v1.zip>`__.
+
+Please follow `the guideline <https://download.pytorch.org/torchaudio/logo/v1/guidelines.pdf>`__ for the proper usage.
+
+.. warning::
+
+   Please do not alter the logo. The guideline lists examples of inproper usages as well, so please check them out before using the logos.
+
+Icon
+----
+
+.. image:: https://download.pytorch.org/torchaudio/logo/v1/icon.png
+   :width: 400
+
+Horizontal
+----------
+
+.. image:: https://download.pytorch.org/torchaudio/logo/v1/logo_horizontal_fullcolor.png
+   :width: 400
+
+|
+
+.. image:: https://download.pytorch.org/torchaudio/logo/v1/logo_horizontal_black.png
+   :width: 400
+
+|
+
+.. raw:: html
+
+    <div style="background-color:black; width: 400px;">
+      <img src="https://download.pytorch.org/torchaudio/logo/v1/logo_horizontal_white.png" width="400"></img>
+    </div>
+
+Vertical
+--------
+
+.. image:: https://download.pytorch.org/torchaudio/logo/v1/logo_vertical_fullcolor.png
+   :width: 400
+
+|
+
+.. image:: https://download.pytorch.org/torchaudio/logo/v1/logo_vertical_black.png
+   :width: 400
+
+|
+
+.. raw:: html
+
+    <div style="background-color:black; width: 400px;">
+      <img src="https://download.pytorch.org/torchaudio/logo/v1/logo_vertical_white.png" width="400"></img>
+    </div>