feat: add svelte

svelte-simple/src/lib/Counter.svelte

@@ -0,0 +1,10 @@
+<script lang="ts">
+  let count: number = 0
+  const increment = () => {
+    count += 1
+  }
+</script>
+
+<button on:click={increment}>
+  count is {count}
+</button>