Adds basic layers

[oke-aditya]

A few layers such as

#61

• Mish
• Swish already in PyTorch use name Silu
• Simple MLP

I don't know other possible layers, will search and keep adding.

[codecov]

Codecov Report

Merging #80 (cf37cde) into master (c574986) will decrease coverage by 0.50%.
The diff coverage is 59.52%.

@@            Coverage Diff             @@
##           master      #80      +/-   ##
==========================================
- Coverage   78.50%   78.00%   -0.51%     
==========================================
  Files          44       49       +5     
  Lines        1540     1582      +42     
==========================================
+ Hits         1209     1234      +25     
- Misses        331      348      +17     

Flag	Coverage Δ
unittests	78.00% <59.52%> (-0.51%)	⬇️

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

Impacted Files	Coverage Δ
quickvision/layers/block_mlp.py	38.88% <38.88%> (ø)
quickvision/layers/functional/act_mish.py	66.66% <66.66%> (ø)
quickvision/layers/act_mish.py	72.72% <72.72%> (ø)
quickvision/layers/__init__.py	100.00% <100.00%> (ø)
quickvision/layers/functional/__init__.py	100.00% <100.00%> (ø)

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[oke-aditya]

I will merge this and start adding tests for layers + losses so that we can build these APIs