Adding an installation script for cuda and cpu

[ai-fast-track]

I added an installation script for cuda11, cuda10, and cpu

[codecov]

Codecov Report

Merging #956 (835d2c7) into master (e5503f7) will increase coverage by 0.02%.
The diff coverage is 82.60%.

@@            Coverage Diff             @@
##           master     #956      +/-   ##
==========================================
+ Coverage   85.62%   85.65%   +0.02%     
==========================================
  Files         251      254       +3     
  Lines        5455     5506      +51     
==========================================
+ Hits         4671     4716      +45     
- Misses        784      790       +6     

Flag	Coverage Δ
unittests	85.65% <82.60%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
icevision/models/mmdet/utils.py	64.28% <20.00%> (-4.35%)	⬇️
icevision/models/mmdet/models/__init__.py	100.00% <100.00%> (ø)
icevision/models/mmdet/models/yolox/__init__.py	100.00% <100.00%> (ø)
...on/models/mmdet/models/yolox/backbones/__init__.py	100.00% <100.00%> (ø)
.../models/mmdet/models/yolox/backbones/resnet_fpn.py	100.00% <100.00%> (ø)
icevision/__init__.py	87.50% <0.00%> (-12.50%)	⬇️
icevision/core/tasks.py	100.00% <0.00%> (ø)
icevision/metrics/metric.py	100.00% <0.00%> (ø)
icevision/models/mmdet/fastai/callbacks.py	100.00% <0.00%> (ø)
icevision/models/torchvision/fastai/callbacks.py	100.00% <0.00%> (ø)
... and 11 more

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