Create README.md

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

numpy/set_printoptions/README.md

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+# set_printoptions
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## Top
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+
+## [numpy.set_printoptions](https://numpy.org/doc/stable/reference/generated/numpy.set_printoptions.html)
+
+```python
+numpy.set_printoptions(precision=None, threshold=None, edgeitems=None, linewidth=None, suppress=None, nanstr=None, infstr=None, formatter=None, sign=None, floatmode=None, *, legacy=None)[source]
+```
+
+> Set printing options.
+
+```python
+import numpy as np
+
+rng = np.random.default_rng()
+a = rng.random((4, 4))
+print(a)
+print()
+
+np.set_printoptions(precision=2)
+print(a)
+```
+
+Output:
+
+```python
+[[0.87875352 0.59057583 0.19169303 0.80039844]
+ [0.90600053 0.98123781 0.42216646 0.40366859]
+ [0.43339631 0.26896463 0.79994133 0.13280545]
+ [0.93352167 0.46244181 0.58408661 0.09560924]]
+
+[[0.88 0.59 0.19 0.8 ]
+ [0.91 0.98 0.42 0.4 ]
+ [0.43 0.27 0.8  0.13]
+ [0.93 0.46 0.58 0.1 ]]
+```
+