[ADD] Simple OCA-style Readme to several modules (#114)

account_usability/readme/CONTRIBUTORS.rst

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+* Alexis de Lattre <alexis.delattre@akretion.com>
+* David Beal <david.beal@akretion.com>

account_usability/readme/DESCRIPTION.rst

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+This modules adds the following functions:
+
+* Add an *Overdue* filter on invoice search view (this feature was previously 
+  located in te module *account_invoice_overdue_filter*)
+* Increase the default limit of 80 lines in account move and account move line view.
+* disable reconciliation "guessing"
+* fast search on *Reconcile Ref* for account move line.
+* add sale dates to invoice report to be compliant with
+  https://www.service-public.fr/professionnels-entreprises/vosdroits/F31808
+* Sale date on qweb invoices
+* A wizard to mark several invoices as sent at once (forward from v8)
+* Default date for Account Move Reversal is now D+1 instead of today
+* Track more fields on invoice (see details in account.py)
+* Add boolean fields `has_discount` and `has_attachment` on invoice
+* Add button "Delete line qty = 0" on supplier invoice
+* Cut name_get() of invoice if too long
+* A script for if Odoo screws up invoice attachment filename
+* help functions for py3o reports
+* Show code on name_get of journal
+* add direct search of journal using code
+* add copy=False on some fields
+* Add unicity constraint on analytic codes per company
+* Better default values on account move
+* Add link from account move line to invoice
+* Add start_date and end_date on bank statements
+* Add transfer_account_id to invoicing config page
+* Improve domain reconciliation widget
+* account.reconcile.model don't copy name to label via onchange
+* Add method to get fiscal position without partner_id
+* Restore drill-through on sale and invoice reports
+* don't attach PDF upon invoice report generation on supplier invoices/refunds
+* Add filter on debit and credit amount for Move Lines
+* Add supplier invoice number in invoice tree view
+
+Together with this module, I recommend the use of the following modules:
+
+* account_invoice_supplier_ref_unique (OCA project account-invoicing)
+* account_move_line_no_default_search (OCA project account-financial-tools)
+* invoice_fiscal_position_update (OCA project account-invoicing)