chore: add vitest config

Author: idleberg

vitest.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+	test: {
+		include: ['src/*.spec.ts'],
+		coverage: {
+			include: ['src/*.ts'],
+		},
+	},
+});