Create examples on how to use neow3j NeoFS SDK

[gsmachado]

Container

• [x] Create a container
• [x] Delete a container
• [x] Get container
• [x] List containers

Object

• [x] Create a file
• [x] Get a file
• [x] Delete a file

Accounting

• [x] Get account's NeoFS balance

Netmap

• [x] Get NeoFS netmap information

[mialbu]

Done (5a9399590c3fa25dd4c57fad35300a201bef599e)