adds initial sqlx migration to set up db schema

DEVELOP.md

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+# Dev Notes
+
+To develop against this project, you will need Rust 1.70 or greater installed.
+
+You will want to install the `sqlx-cli` tool via Cargo: `cargo install sqlx-cli`
+
+You will need to initialize a sqlite database store: `touch aural_isle.sqlite.db`
+
+You will need to copy the example env file to .env: `cp env.example .env`
+
+Then you should be able to run the initial database migrations: `sqlx migrate run`