Cleaning up the project structure

[andrey-berdnik]

• add .gitignore
• update cmake file (add project name, add gmock_main lib)
• Add how-to to readme file
• Add "Course assignment" to doc directory
• fix typo parce->parse
• fix typo test->tests
• Remove test-code from main function
• update unit-testing structure for get possibility run all tests by one command

[ValentinSidorov]

Good

[zonmen]

Good. Small addition, we need to update Cmake requirements into 3.11 version(because of using "FetchContent").

[andrey-berdnik]

Good. Small addition, we need to update Cmake requirements into 3.11 version(because of using "FetchContent").

Thanks, updated

[zonmen]

One more thing, when I parse test file, int structure stdout_mode always equal false, so something wrong with yaml_parce.cpp

[andrey-berdnik]

• update unit-testing structure for get possibility run all tests by one command

Will be changed in another issue, thanks