Add module 'product_contract'.

The module is taken from PR: OCA/contract#959 (comment) - commit: df3e3f380ba3fa4d64f8884a754036eafdf616ab + I fixed a bug by removing default values to computed fields on SO Line;

product_contract/README.rst

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+============================
+Recurring - Product Contract
+============================
+
+.. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Beta
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fcontract-lightgray.png?logo=github
+    :target: https://github.com/OCA/contract/tree/14.0/product_contract
+    :alt: OCA/contract
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/contract-14-0/contract-14-0-product_contract
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runbot-Try%20me-875A7B.png
+    :target: https://runbot.odoo-community.org/runbot/110/14.0
+    :alt: Try me on Runbot
+
+|badge1| |badge2| |badge3| |badge4| |badge5| 
+
+This module adds support for products to be linked to contract templates.
+
+A contract is created on ``sale.order`` confirmation for each different template used in sale order line where recurrence details are set too.
+
+Contract product are ignored on invoicing process and pass to nothing to invoice directly.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Usage
+=====
+
+To use this module, you need to:
+
+#. Go to Sales -> Products and select or create a product.
+#. Check "Is a contract" and select the contract template related to the
+   product
+#. Define default recurrence rules
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/contract/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed
+`feedback <https://github.com/OCA/contract/issues/new?body=module:%20product_contract%0Aversion:%2014.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+~~~~~~~
+
+* LasLabs
+* ACSONE SA/NV
+
+Contributors
+~~~~~~~~~~~~
+
+* Ted Salmon <[email protected]>
+* Souheil Bejaoui <[email protected]>
+* `Tecnativa <https://www.tecnativa.com>`__:
+
+  * Ernesto Tejeda
+  * Pedro M. Baeza
+
+Maintainers
+~~~~~~~~~~~
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+.. |maintainer-sbejaoui| image:: https://github.com/sbejaoui.png?size=40px
+    :target: https://github.com/sbejaoui
+    :alt: sbejaoui
+
+Current `maintainer <https://odoo-community.org/page/maintainer-role>`__:
+
+|maintainer-sbejaoui| 
+
+This module is part of the `OCA/contract <https://github.com/OCA/contract/tree/14.0/product_contract>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.

product_contract/__init__.py

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+# Copyright 2017 LasLabs Inc.
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from . import models

product_contract/__manifest__.py

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+# Copyright 2017 LasLabs Inc.
+# Copyright 2018 ACSONE SA/NV.
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+{
+    "name": "Recurring - Product Contract",
+    "version": "16.0.1.0.0",
+    "category": "Contract Management",
+    "license": "AGPL-3",
+    "author": "LasLabs, " "ACSONE SA/NV, " "Odoo Community Association (OCA)",
+    "website": "https://github.com/OCA/contract",
+    "depends": ["product", "contract", "sale"],
+    "data": [
+        "views/res_config_settings.xml",
+        "views/contract.xml",
+        "views/product_template.xml",
+        "views/sale_order.xml",
+    ],
+    "installable": True,
+    "application": False,
+    "external_dependencies": {"python": ["dateutil"]},
+    "maintainers": ["sbejaoui"],
+}