re-add

tutorials/placeholder.py

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+"""
+Placeholder for example
+===========================
+
+This example is a placeholder that uses the sphinx-gallery syntax
+for creating examples
+"""
+
+import aurora
+import numpy as np
+import matplotlib.pyplot as plt
+
+###############################################################################
+# Step 1
+# ------
+# Some description of what we are doing in step one
+
+x = np.linspace(0, 4 * np.pi, 100)
+
+# take the sin(x)
+y = np.sin(x)
+
+
+###############################################################################
+# Step 2
+# ------
+# Plot it
+
+fig, ax = plt.subplots(1, 1)
+ax.plot(x, y)