Introduce initial implementation of the vmic CLI with PipeWire integration

- Added `Cargo.toml` to define dependencies and project metadata.
- Implemented core CLI functionality for managing virtual microphones (`create`, `edit`, `delete`, `list`, `route`, and `wipe` commands) using `clap`.
- Integrated `rusqlite` for persistent state storage and `pipewire` to manage PipeWire nodes.
- Ensured graceful handling of feedback loops and system defaults during virtual mic creation and deletion.
- Added error handling via `thiserror` for cleaner error definitions.

Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name        = "vmic"
+version     = "0.1.0"
+edition     = "2021"
+description = "Create and manage PipeWire virtual microphones."
+license     = "AGPL-3+"
+
+[[bin]]
+name = "vmic"
+path = "src/main.rs"
+
+[dependencies]
+clap          = { version = "4", features = ["derive"] }
+clap_complete = "4"
+
+thiserror     = "^2"
+dirs          = "6"
+
+rusqlite      = { version = "^0", features = ["bundled"] }
+pipewire      = "=0.8.0"
+libc          = "0.2"
+
+# Keep panics from corrupting the sqlite connection mid-transaction; abort
+# is fine for a CLI as there is no long-lived state to unwind for.
+[profile.release]
+panic = "abort"
+lto   = true