Matvei Vdovitsyn

Added some comments to the functions I did not understand at first glance.

Add CONTRIBUTING.md to explicitly state contibution guidelines for this project: what can other people suggest, work on, how can we participate in the development

Forbid vendor for all code

4

Quite often I've come to see "bad" dependencies being used in code to solve problems, that are already solved via different dependencies in the larger part of the codebase. It...