add web_widget_mpld3_chart

web_widget_mpld3_chart/readme/CONTRIBUTORS.rst

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+* Jordi Ballester Alomar <jordi.ballester@forgeflow.com>

web_widget_mpld3_chart/readme/CREDITS.rst

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+* This module uses the library `mpld3 <https://github.com/mpld3/mpld3>`__
+  which is under the open-source BSD 3-clause "New" or "Revised" License.
+  Copyright (c) 2013, Jake Vanderplas
+* Odoo Community Association (OCA)

web_widget_mpld3_chart/readme/DESCRIPTION.rst

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+This module adds the possibility to insert mpld3 charts into Odoo standard views.
+This is an interactive D3js-based viewer which brings matplotlib graphics to the browser.
+
+If you want to see some samples of mpld3's capabilities follow this `link
+<http://mpld3.github.io/>`_.

web_widget_mpld3_chart/readme/INSTALL.rst

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+You need to install the python mpld3 library::
+
+    pip install mpld3

web_widget_mpld3_chart/readme/USAGE.rst

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+To insert a mpld3 chart in a view proceed as follows:
+
+#. Import the required libraries::
+
+    import matplotlib.pyplot as plt, mpld3
+
+#. Declare a text computed field like this::
+
+    mpld3_chart = fields.Text(
+        string='Mpld3 Chart',
+        compute='_compute_mpld3_chart',
+    )
+
+#. In its computed method do::
+
+    def _compute_mpld3_chart(self):
+        for rec in self:
+            # Design your mpld3 figure:
+            plt.scatter([1, 10], [5, 9])
+            figure = plt.figure()
+            rec.mpld3_chart = mpld3.fig_to_html(figure)
+
+#. In the view, add something like this wherever you want to display your
+   mpld3 chart::
+
+    <div>
+        <field name="mpld3_chart" widget="mpld3_chart" nolabel="1"/>
+    </div>