Add examples using CSL to create simple, metadata, minting tokens/nft transactions

[tienna]

This PR contains example scripts using CSL to:

• Build a simple transaction: 1 input and 02 outputs (from Alice -> Bob and change)
• Create a transaction containing metadata
• Build a mint tokens transaction
• Build a mint transaction to NFT
• Sign a message (in this case, sign a CBOR transaction built by Rosetta java)

[lisicky]

Hi @tienna ! Thanks so much for your PR, we will have a look : )

[tienna]

Thank @lisicky. share any comments/feedbacks if you have.

[lisicky]

Hi @tienna ! have changes in your PR, please have a look

[tienna]

Thank you @lisicky for optimizing my code. I tested it and it worked fine.