add basic examples for database-wasm package

bindings/javascript/examples/database-node/README.md

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+# database-node
+
+This is a minimal example showing how to use [`@tursodatabase/database`](https://www.npmjs.com/package/@tursodatabase/database) in the node.js
+
+---
+
+## Usage
+
+```bash
+npm install
+node index.mjs
+```

bindings/javascript/examples/database-node/index.mjs

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+import { connect } from "@tursodatabase/database";
+
+const db = await connect("local.db", {
+    timeout: 1000, // busy timeout for handling high-concurrency write cases
+});
+
+// execute multiple SQL statements with exec(...)
+await db.exec(`
+    CREATE TABLE IF NOT EXISTS guestbook (comment TEXT, created_at DEFAULT (unixepoch()));
+    CREATE INDEX IF NOT EXISTS guestbook_idx ON guestbook (created_at);
+`);
+
+// use prepared statements and bind args to placeholders later
+const insert = db.prepare(`INSERT INTO guestbook(comment) VALUES (?)`);
+
+// use run(...) method if query only need to be executed till completion
+await insert.run([`hello, turso at ${Math.floor(Date.now() / 1000)}`]);
+
+const select = db.prepare(`SELECT * FROM guestbook ORDER BY created_at DESC LIMIT ?`);
+// use all(...) or get(...) methods to get all or one row from the query
+console.info(await select.all([5]))

bindings/javascript/examples/database-node/package.json

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+{
+  "name": "database-node",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "@tursodatabase/database": "^0.2.0"
+  }
+}