Merge pull request #124 from forFudan/prelude

[change] Add `Idx` and `NDArrayShape` to `prelude`

Author: MadAlex1997

numojo/prelude.mojo

@@ -21,4 +21,6 @@ from numojo.prelude import *
 """
 
 from .core.ndarray import NDArray
+from .core.index import Idx
+from .core.ndarrayshape import NDArrayShape
 from .core.datatypes import i8, i16, i32, i64, u8, u16, u32, u64, f16, f32, f64