Create README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

numpy/ndindex/README.md

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+# ndindex
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## Top
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+
+## [numpy.ndindex](https://numpy.org/doc/stable/reference/generated/numpy.ndindex.html)
+
+```python
+class numpy.ndindex(*shape)[source]
+```
+
+> An N-dimensional iterator object to index arrays.
+> 
+> Given the shape of an array, an ndindex instance iterates over the N-dimensional index of the array. At each iteration a tuple of indices is returned, the last dimension is iterated over first.
+
+
+```python
+import numpy as np
+
+for index in np.ndindex((3, 2, 1)):
+    print(index)
+```
+
+Output:
+
+```python
+(0, 0, 0)
+(0, 1, 0)
+(1, 0, 0)
+(1, 1, 0)
+(2, 0, 0)
+(2, 1, 0)
+```