Lib: Add index.ts for easier importing

src/lib/components/index.ts

@@ -0,0 +1,7 @@
+import FileInput from "./FileInput.svelte";
+import Input from "./Input.svelte";
+import Password from "./Password.svelte";
+import Username from "./Username.svelte";
+import Button from "./Button.svelte";
+
+export { FileInput, Input, Username, Password, Button };