[ADD] Widget Numeric step

web_widget_numeric_step/readme/CONTRIBUTORS.rst

@@ -0,0 +1,3 @@
+* `GRAP <http://www.grap.coop>`_:
+
+  * Quentin DUPONT <quentin.dupont@grap.coop>

web_widget_numeric_step/readme/DESCRIPTION.rst

@@ -0,0 +1,2 @@
+This widget changes input number field and make it easier to incremente the number thanks to 2 buttons (+ and -).
+Use JS native logic for input number, so you can use the options ``min``, ``max``, ``step``, ``placeholder``.

web_widget_numeric_step/readme/USAGE.rst

@@ -0,0 +1,26 @@
+In your xml view, add ``widget="numeric_step"``
+This will add the 2 buttons "+" and "-" just next to the input field in edit mode.
+Iteration step by default is 1.
+
+.. figure:: ../static/description/add_two_buttons.png
+
+
+**Optional**
+
+Add an option to choose the step iteration and limits (min and max values).
+
+Example for an 0.25 step, min to -1 and max to 10 :
+
+``<field name="sale_delay" widget="numeric_step" options="{'step': 0.25, 'min': -1, 'max': 10}" /> days``
+
+**Examples**
+
+Iteration with 0.25 step, min to -1 and max to 10.
+
+Start to incremente with button, continue incrementing with scrolling mouse.
+
+.. figure:: ../static/description/step0,25andlimits.gif
+
+Iteration with 10 step, max limit 15, placeholder with onchange
+
+.. figure:: ../static/description/step10_limit15_placeholder117_with_onchange.gif