[WIP] Initial commit to add ROCm section for building from source

[pruthvistony]

Changes to documentation to help users use pyTorch with ROCm support

Fixes - framework-internal 155

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💊 CI failures summary and remediations

As of commit 359422e (more details on the Dr. CI page):

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• 2/2 failures possibly* introduced in this PR
  • 2/2 non-scanned failure(s)

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ci.pytorch.org: 1 failed

• Failed: pr/pytorch-linux-bionic-rocm4.0.1-py3.6

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[codecov]

Codecov Report

Merging #53416 (359422e) into master (5ebfabb) will decrease coverage by 0.44%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #53416      +/-   ##
==========================================
- Coverage   78.07%   77.63%   -0.45%     
==========================================
  Files        1852     1852              
  Lines      181161   181161              
==========================================
- Hits       141443   140644     -799     
- Misses      39718    40517     +799     

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[pruthvistony]

Plan to drop this PR for now and revisit later.