Scannet doc

[hjin2902]

Add docs of ScanNet including:

• data preparation: explanation about raw data and annotations
• train pipeline: load data and pre-processing
• metrics: evaluation

[codecov]

Codecov Report

Merging #664 (1d1412d) into master (c1f6bba) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 1d1412d differs from pull request most recent head 537381b. Consider uploading reports for the commit 537381b to get more accurate results

@@           Coverage Diff           @@
##           master     #664   +/-   ##
=======================================
  Coverage   51.02%   51.02%           
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  Files         204      204           
  Lines       15395    15395           
  Branches     2492     2492           
=======================================
  Hits         7856     7856           
  Misses       7021     7021           
  Partials      518      518           

Flag	Coverage Δ
unittests	51.02% <100.00%> (ø)

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Impacted Files	Coverage Δ
mmdet3d/__init__.py	81.48% <100.00%> (ø)

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[Tai-Wang]

Maybe we can simplify the code scripts and replace them with your summary for the data processing steps. Too many codes will make the doc unnecessarily too long.