README simplified

[h1alexbel]

@hizmailovich take a look, please closes #111

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PR-Codex overview

This PR focuses on adding default rule values for missing rules in the project.yml file.

Detailed summary:

• Added a todo comment to handle the situation when rules are not present in project.yml
• Mentioned the need to decide default values for these rules or omit some of them
• Updated the README.md file with changes related to the project and its integration
• Added a section explaining the project.yml notation and its elements
• Added a section explaining the Jobs and Docs in the project
• Updated the section about Secret Variables and their usage
• Updated the section about supported platforms and document storages
• Added instructions for running the Java project

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[codecov[bot]]

Codecov Report

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

Comparison is base (075c00c) 80.80% compared to head (f68305d) 80.80%. Report is 20 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #115 +/- ## ========================================= Coverage 80.80% 80.80% Complexity 119 119 ========================================= Files 39 39 Lines 396 396 Branches 19 19 ========================================= Hits 320 320 Misses 70 70 Partials 6 6 ```

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[h1alexbel]

@rultor merge

[rultor]

@rultor merge

@h1alexbel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@h1alexbel Done! FYI, the full log is here (took me 4min)