Plea for updated Getting Started
**Describe the bug**
The basic "hello world" example in README for 1.x or 2.xrc does not work for 1.x or 2.x

For 1.x then 2.xrc following the README, I ran into problems with `setup.py`, that `get_nim_extensions` was not defined. I found it in `nexporter.py` so imported it explicitly, but then ran into some variables being referenced before assignment, such as `nimexe` so I hard-coded the path just to progress. Then nim cache files were generated but I ran into `mod_name` referenced before assignment. I feel like I'm not using nimporter in the intended fashion and have bypassed a critical step. Hint, please?