docs: restore the contents for createDtsBody()

README.md

@@ -264,6 +264,34 @@ type GenerateDtsFileOptions = Partial<{
 
 To create a custom parser, see the [Writing a custom parser](./src/parser/README.md#writing-a-custom-parser) section.
 
+### `createDtsBody`
+
+```ts
+function createDtsBody(
+  name: string,
+  object: object,
+  options?: CreateDtsOptions,
+): string;
+
+type CreateDtsOptions = Partial<{
+  defaultType: string;
+  importTypes: Import[];
+}>;
+
+type Import = {
+  name: string;
+  from: string;
+};
+```
+
+- `name`: Name of the type.
+- `object`: Content for the types.
+- `options`
+  - `defaultType`: Type to use when the sheet type is an empty string, `undefined`, or `null`. Default is `any`.
+  - `importTypes`: Types to import from inside the file.
+    - `name`: Name of the type to import.
+    - `from`: File path to import the type from.
+
 ## License
 
 [MIT](./LICENSE) @Gumball12