Create README.md

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

matplotlib/animation_and_slider/README.md

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+# Animation and Slider
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## The goal
+
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+
+## Test data
+
+```python
+import numpy as np
+import matplotlib.pyplot as plt
+
+axis = np.arange(-100, 101) / 100.0
+
+x = axis[:, np.newaxis, np.newaxis].copy()
+y = axis[np.newaxis, :, np.newaxis].copy()
+z = axis[np.newaxis, np.newaxis, :].copy()
+
+r = np.sqrt(x**2 + y**2 + z**2)
+
+mask_0 = r > 0.75
+r = 1.0 / (r + 1.0)
+r[mask_0] = 0
+
+plt.imshow(r[100, :, :], cmap="hot")
+plt.colorbar()
+plt.title("Cut through center of x-axis")
+plt.show()
+```
+
+![image0](image0.png)
+