Add statsd metrics addon

monitoring_statsd/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+    :alt: License
+
+============================
+Monitoring: Statsd metrics
+============================
+
+Send metrics to a Statsd (or Statsd compatible) server.
+
+Currently, it sends:
+ * time taken to process a click on a button
+ * time taken to process a workflow signal
+ * time taken by other requests
+
+Configuration
+=============
+
+Activate with the environment variable:
+
+* ``ODOO_STATSD=1``
+
+Configure Statsd:
+
+* ``STATSD_HOST=host``
+* ``STATSD_PORT=port``
+
+Configure differentiator:
+
+* ``STATSD_CUSTOMER`` must contain the name of the client
+* ``STATSD_ENVIRONMENT`` might contain the name of the environment, by
+  default, it will use the ``server_environment``'s one