Add Snippets

[LimpidCrypto]

A directory where people can add snippets. It is a place to add code that do not really fit to a library, but could be helpful to people. This issue is only about adding that directory.

Examples:

• function to safely delete an account

Walkthroughs:

• https://github.com/XRPLF/xrpl.js/blob/main/packages/xrpl/snippets/src/sendEscrow.ts