Added a bit of API description

README.md

@@ -12,15 +12,36 @@ yarn add svg-to-vue
 ``` js
 const svgToVue = require('svg-to-vue');
 
-const svg = `
+const code = `
   <svg width="300" height="200" xmlns="http://www.w3.org/2000/svg">
     <rect width="100%" height="100%" fill="red" />
   </svg>
 `;
 
-svgToVue(svg)
+svgToVue(code)
   .then((component) => {
     // `component` contains Vue component definition
     console.log(component);
   });
 ```
+
+## API
+``` js
+svgToVue(code, {
+  svgoConfig: {
+    plugins: [
+      {
+        prefixIds: true,
+      },
+    ],
+  },
+  svgoPath: 'some/path/to.svg',
+  esmExport: true,
+});
+```
+
+| Name | Type | Default value | Description |
+| - | - | - | - |
+| `svgoConfig` | `Object`/`Boolean` | `{}` | Configuration object passed to SVGO or `false` to disable optimization |
+| `svgoPath` | `String` | `null` | Path to SVG file which is used by SVGO `prefixIds` plugin to generate unique IDs |
+| `esmExport` | `Boolean` | `false` | Module export format: `true` for EcmaScript or `false` for CommonJS |