ETNA-794 Add minimal examples to all TSDatasets methods #67

[martins0n]

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

Tested examples with doctest in important public methods.

Related Issue

Closing issues

closes #67

[codecov-commenter]

Codecov Report

Merging #92 (f0fb253) into master (fecc27f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #92   +/-   ##
=======================================
  Coverage   87.71%   87.71%           
=======================================
  Files          54       54           
  Lines        2466     2466           
=======================================
  Hits         2163     2163           
  Misses        303      303           

Impacted Files	Coverage Δ
etna/analysis/plotters.py	13.97% <ø> (ø)
etna/loggers/__init__.py	100.00% <ø> (ø)
etna/datasets/tsdataset.py	86.77% <100.00%> (ø)

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[julia-shenshina]

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