[DOC] Add example code to generate hash #930
Description
generate the hash of the uploaded
https://docs.lukso.tech/learn/assets#generate-the-json-file
Add more example code to show how it is done, esp. the part the hashes the files.
It could be nice to make a reference to:
https://docs.lukso.tech/tools/lsp-utils/LSP2ERC725YJSONSchema#encodeasseturl