Merge PR #687 into 17.0

Signed-off-by gurneyalex

queue_job/readme/CONTEXT.md

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+Odoo treats task synchronously, like when you import a list of products it will treat each line in one big task.
+"Queue job" gives you the ability to detail big tasks in many smaller ones.
+
+Imagine you have a lot of data to change for thousand orders, you can do it in one step and cause a heavy load on the server, and this may affect the performance of Odoo. With queue_job you can divide the work in jobs and run thousand jobs (one job for each orders).
+An other benefit is if one line failed it doesn't block the processing of the others, as the jobs are independent. 
+Plus you can schedule the jobs and set a number of retries.
+
+Here are some community usage examples:
+
+* Mass sending invoices: [account_invoice_mass_sending](https://github.com/OCA/account-invoicing/tree/17.0/account_invoice_mass_sending)
+* Import data in the background: [base_import_async](https://github.com/OCA/queue/tree/17.0/base_import_async)
+* Export data in the background: [base_export_async](https://github.com/OCA/queue/tree/17.0/base_export_async)
+* Generate contract invoices with jobs: [contract_queue_job](https://github.com/OCA/contract/tree/17.0/contract_queue_job)
+* Generate partner invoices with jobs:[partner_invoicing_mode](https://github.com/OCA/account-invoicing/tree/17.0/partner_invoicing_mode)
+* Process the Sales Automatic Workflow actions with jobs: [sale_automatic_workflow_job](https://github.com/OCA/sale-workflow/tree/17.0/sale_automatic_workflow_job)