Add Moonbirds NFT collection stats example

[oraclown]

• Provides description, encoding/decoding examples in Py/Sol
• Here's an example submitValue tx: https://mumbai.polygonscan.com/tx/0x99e51ccd85e63879d2084046ff32925593a7440d4e41641cbea12476aa0d857a

[tkernell]

This looks great. It may be better to use uint256[] for the response type unless we expect negative prices, as unsigned integers are more commonly used in solidity. But this will work either way for its intended purpose, especially for hackathons.

[oraclown]

This looks great. It may be better to use uint256[] for the response type unless we expect negative prices, as unsigned integers are more commonly used in solidity. But this will work either way for its intended purpose, especially for hackathons.

done