[SDK] Create confluence page of useage scenarios

[claytonneal]

Summary

Idea is to document top 10 scenarios where SDK can be used, for example:

• Indexing events & decoding event data that is not a topic
• Deploying contracts, interacting with contracts, type hinting of contract functions
• Using hardhat (tbc)
• Creating multi-clause fee delegated transaction, estimating the gas cost with padding, and signing it with sender and gas payer (why not try with HDKey or with Vechain private key signer)
• Certificates creating, signing, validating - Same for SignedTypedData - creating, signing, validating!
• plus others!