docs: add note on needed config changes for TypeScript

Author: wolfy1339

README.md

@@ -52,6 +52,9 @@ There is one method for each REST API endpoint documented at [https://developer.
 
 Parameter and response types for all endpoint methods exported as `{ RestEndpointMethodTypes }`.
 
+> [!IMPORTANT]
+> As we use [conditional exports](https://nodejs.org/api/packages.html#conditional-exports), you will need to adapt your `tsconfig.json`. See the TypeScript docs on [package.json "exports"](https://www.typescriptlang.org/docs/handbook/modules/reference.html#packagejson-exports).
+
 Example
 
 ```ts