check Rust examples and decide where to store them for MVP

[a-zorina]

The latest version of the Rust examples is in this PR:
hyperledger-iroha/iroha-2-examples#22

We need to check if they are going to be up-to-date with MVP, decide where we will store them (original plan was to store them in the main Iroha repository) and merge them into wherever we ultimately decide to put them.

[mversic]

I don't understand why we crated a separate repo iroha-2-examples. If I'm asked I'd put examples in the main iroha repo

[mversic]

IMO we should get rid of iroha-2-examples repo and put examples into their respective repos (main repo and sdk repos)