Add placeholder

Author: noorbuchi

examples/tutorials/datetime.py

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+"""
+Plotting Datetime Data
+================
+
+THIS IS A PLACEHOLDER WORK IN PROGRESS
+Plotting vectors is handled by :meth:`pygmt.Figure.plot`.
+
+.. note::
+
+    This tutorial assumes the use of a Python notebook, such as IPython or Jupyter Notebook.
+    To see the figures while using a Python script instead, use
+    ``fig.show(method="external")`` to display the figure in the default PDF viewer.
+
+    To save the figure, use ``fig.savefig("figname.pdf")`` where ``"figname.pdf"``
+    is the desired name and file extension for the saved figure.
+"""
+# sphinx_gallery_thumbnail_number = 0