initial commit

- add .gitignore
  - node modules
  - generated js files
- add prettier and eslint configurations
  - prettier: some options configured
  - eslint: js linting disabled
- initialize npm, install packages
- add vscode settings
  - prettier formatting on save disabled

.prettierrc.mjs

@@ -0,0 +1,14 @@
+/**
+ * @see https://prettier.io/docs/configuration
+ * @type {import("prettier").Config}
+ */
+const config = {
+  trailingComma: "es5",
+  tabWidth: 4,
+  useTabs: true,
+  semi: true,
+  singleQuote: true,
+  printWidth: 120
+};
+
+export default config;