Instruction for custom model and transform creation

[WinstonDovlatov]

IMPORTANT: Please do not create a Pull Request without creating an issue first.

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Proposed Changes

Related Issue

Closing issues

closes #76

[codecov-commenter]

Codecov Report

Merging #180 (1cef838) into master (9c37a03) will decrease coverage by 0.92%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
- Coverage   87.78%   86.85%   -0.93%     
==========================================
  Files          75       75              
  Lines        3438     3432       -6     
==========================================
- Hits         3018     2981      -37     
- Misses        420      451      +31     

Impacted Files	Coverage Δ
etna/models/nn/deepar.py	75.51% <0.00%> (-24.49%)	⬇️
etna/models/nn/tft.py	76.47% <0.00%> (-23.53%)	⬇️
etna/transforms/pytorch_forecasting.py	92.40% <0.00%> (-7.60%)	⬇️
etna/loggers/base.py	92.15% <0.00%> (-2.08%)	⬇️
etna/loggers/wandb_logger.py	33.33% <0.00%> (-1.50%)	⬇️
etna/loggers/console_logger.py	92.30% <0.00%> (-0.29%)	⬇️
etna/metrics/base.py	96.42% <0.00%> (-0.07%)	⬇️
etna/models/base.py	97.43% <0.00%> (-0.04%)	⬇️

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[iKintosh]

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