Create README.md

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

matplotlib/subplot/README.md

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+# subplot
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## The goal
+
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+
+```python
+import numpy as np
+
+import matplotlib.pyplot as plt
+
+rng = np.random.default_rng()
+
+plt.figure(1)
+plt.subplot(2, 2, 1)
+plt.imshow(rng.random((10, 100)))
+plt.title("A")
+plt.subplot(2, 2, 2)
+plt.imshow(rng.random((5, 10)))
+plt.title("B")
+plt.subplot(2, 2, 3)
+plt.imshow(rng.random((50, 20)))
+plt.title("C")
+plt.subplot(2, 2, 4)
+plt.imshow(rng.random((100, 200)))
+plt.title("D")
+plt.show()
+```
+
+![image0](image0.png)
+
+