Add Quick Start example to readme with several usability fixes

[gkirgizov]

Changes:

• Add self-sufficient simple_run.py example with simple setup of Optimizer
• Objective can now be simple constructed from simple metric
• Change usages of OptGraph to just Graph in some places of Optimzier
• Default parameter changes (max_arity=4, max_depth=10, early_stopping_iterations=50)
• Default mutation set is changed to simple single-point mutations

Closes #48

[aim-pep8-bot]

Hello @gkirgizov! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file examples/synthetic_graph_evolution/graph_search.py:

Line 12:1: F401 'golem.core.optimisers.genetic.operators.crossover.CrossoverTypesEnum' imported but unused
Line 17:1: F403 'from golem.metrics.graph_metrics import *' used; unable to detect undefined names
Line 20:38: F405 'nx' may be undefined, or defined from star imports: golem.metrics.graph_metrics
Line 22:36: F405 'Sequence' may be undefined, or defined from star imports: golem.metrics.graph_metrics
Line 56:31: F405 'spectral_dist' may be undefined, or defined from star imports: golem.metrics.graph_metrics
Line 57:32: F405 'spectral_dist' may be undefined, or defined from star imports: golem.metrics.graph_metrics
Line 60:31: F405 'degree_distance' may be undefined, or defined from star imports: golem.metrics.graph_metrics
Line 61:35: F405 'size_diff' may be undefined, or defined from star imports: golem.metrics.graph_metrics
Line 67:55: E226 missing whitespace around arithmetic operator

• In the file examples/synthetic_graph_evolution/tree_search.py:

Line 74:70: W291 trailing whitespace
Line 77:1: W293 blank line contains whitespace

Comment last updated at 2023-04-24 05:38:25 UTC

[gkirgizov]

Ppe8 issues for graph_search & tree_search are already fixed in parallel PR, so I ignore them to avoid conflicts

[codecov-commenter]

Codecov Report

Merging #86 (b1dc622) into main (577dd6f) will increase coverage by 0.01%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   71.31%   71.32%   +0.01%     
==========================================
  Files         115      115              
  Lines        6456     6456              
==========================================
+ Hits         4604     4605       +1     
+ Misses       1852     1851       -1     

Impacted Files	Coverage Δ
golem/core/optimisers/objective/objective.py	84.90% <75.00%> (-1.37%)	⬇️
golem/core/adapter/adapter.py	89.74% <100.00%> (ø)
golem/core/optimisers/genetic/gp_optimizer.py	97.61% <100.00%> (-0.03%)	⬇️
golem/core/optimisers/genetic/gp_params.py	100.00% <100.00%> (ø)
golem/core/optimisers/optimization_parameters.py	97.05% <100.00%> (ø)
golem/core/optimisers/optimizer.py	94.36% <100.00%> (ø)
golem/core/optimisers/populational_optimizer.py	89.41% <100.00%> (-0.13%)	⬇️

... and 4 files with indirect coverage changes

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[maypink]

мб гиперссылки вставить на файлы с примерами? вроде их положение достаточно постоянно, не сломается через неделю

[gkirgizov]

добавил