Improve README

[naXa777]

Improve README.md and/or README.en.md. Or add a new README in your own language.

[fpkmatthi]

I can do dutch if you want

[naXa777]

@fpkmatthi Sounds good! There's a lot of text... feel free to skip some sections that you think are less important. And do not forget to put crosslinks in the existing readme files.

[duskmirage]

I'll do indonesian starting tomorrow, just commenting as a placeholder so no one accidentally works on the same issue

[o-niko]

I can do PT-BR if it's ok

[naXa777]

@myakiju let's do it. Your help is appreciated:)

1. Keep in mind that complete formal translation is not required. It is possible, but it may result in some weird terminologies.
2. Try to use quotes and links to the content in your language. For example, I referenced Pivotal content in English readme and similar content from Habr in Russian. Though they differ in details they have the same meaning.