[DOC] Updated readme and contributing files (bp #1284) (#1294)

* [DOC] Updated readme and contributing files (#1284)

* Updated readme and contributing files

(cherry picked from commit 6a64398)

# Conflicts:
#	README.md

* Update README.md

Fix merge conflicts in README

* Added pics for README

Co-authored-by: Ekaterina Mekhnetsova <[email protected]>
Co-authored-by: Ekaterina Mekhnetsova <[email protected]>

[2020-u3-rls] Fix class voting for kNN (#962)

* Fix class voting for kNN

* Fix kNN kdtree examples

fix one-algorithm build and spicific prediction case after probabilit…

…y feature (#177)

Merge pull request #85 from dmitry741/dev/dmitrypa-sdl-err-memory-han…

…dling

SDL: err-memory-handling