chore: initialize project

src/lib/demo-store.ts

@@ -0,0 +1,14 @@
+import { Store } from '@tanstack/store'
+
+export const store = new Store({
+  firstName: 'Jane',
+  lastName: 'Smith',
+})
+
+export const fullName = new Store(
+  `${store.state.firstName} ${store.state.lastName}`,
+)
+
+store.subscribe(() => {
+  fullName.setState(() => `${store.state.firstName} ${store.state.lastName}`)
+})