contribution guidelines: feedback from @0xn3va

[nikitastupin]

The feedback was originally given in #8 Copy-pasting it here for further consideration:

I'd like to add that I've read your contribution guide at https://github.com/nikitastupin/orgs-data/blob/main/CONTRIBUTING.md but it looks too complicated to contribute changes :) So, I tried to contribute in this way, if you do not like it, feel free to decline this PR, I'm completely OK with that. Thanks!

The contribution guide itself is easy to use, but proposing multiple changes through Google forms is inconvenient. From my point of view, it would be possible to add an option through opening a PR and offer a general approach to opening it, for example, an author should follow the defined notation and pre-process final tables before opening a PR (sort them, replace spaces with tabs, and etc.). If this path is acceptable, it would be awesome to have such option in the future.