Create ERC721 example application and documents

[P1sar]

In order to provide guide for ERC721 usage we need to build small example application and Guide that describes how this works.

Implementation details

Build example with usage of basicFeeHandler but documentation should also mention both (with fees and without)
Example app should be able to run with local setup so there is should be guide to run it locally.
Example application should have drop down for owned NFT tokens from selected collection

Testing details

[] Recheck that everything works locally couple times, ask someone else to run it to make sure that it is working fine

Acceptance Criteria

[] Example application implemented
[] Readme guide for this application written