Improve community standards

[DRMPN]

Added:

• Code of conduct,
• Contributing,
• Issue templates,
• Pull request template

Resolves: https://github.com/aimclub/FEDOT/issues/1191 Examples:

• Pull request template
• Issues template

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (70d470a) 79.15% compared to head (a93fd5b) 79.15%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1226 +/- ## ======================================= Coverage 79.15% 79.15% ======================================= Files 145 145 Lines 9937 9937 ======================================= Hits 7866 7866 Misses 2071 2071 ```

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[nicl-nno]

Если у @andreygetmanov нет комментариев, то можно мержить.