add Espanso schemas

[rosidae]

from espanso/espanso's about section:

A Privacy-first, Cross-platform Text Expander written in Rust

descriptions adapted from https://espanso.org/docs/configuration/basics/#the-config-directory and https://espanso.org/docs/configuration/basics/#the-match-directory

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @madskristensen and @hyperupcall - if they write a comment saying "LGTM" then it will be merged.

[madskristensen]

Thanks