Add stub TUI app

Cargo.toml

@@ -1,3 +1,3 @@
 [workspace]
 resolver = "2"
-members = ["core"]
+members = ["core", "tui"]

tui/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "ged-tui"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

tui/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}