Add node SDK (#19)

packages/sdk/.eslintrc.js

@@ -0,0 +1,10 @@
+/** @type {import("eslint").Linter.Config} */
+module.exports = {
+  root: true,
+  extends: ["@unsend/eslint-config/library.js"],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    project: "./tsconfig.json",
+    tsconfigRootDir: __dirname,
+  },
+};