[ADD] web_widget_pattern

web_widget_pattern/readme/CONTRIBUTORS.md

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+-   Holger Brunn \<mail@hunki-enterprises.com> (https://hunki-enteprises.com)

web_widget_pattern/readme/DESCRIPTION.md

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+This module allows to use [patterns](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/pattern) in text fields in the backend.

web_widget_pattern/readme/ROADMAP.md

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+- allow to optionally validate fields against its pattern server side
+- support text, url, email, phone, ... fields
+- support using a pattern from a computed field

web_widget_pattern/readme/USAGE.md

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+You can either define a pattern in your Python source code on a field as in
+
+```python
+    my_field = fields.Char(pattern='[0-9]')
+```
+
+or on view level as in
+
+```xml
+    <field name="my_field" pattern="[0-9]" />
+```
+
+Demo data adds a pattern on the street2 field on partner forms to only allow numbers.