Initial commit: OCA Payroll packages (5 packages)

odoo-bringout-oca-payroll-hr_payroll_document/doc/MODELS.md

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+# Models
+
+Detected core models and extensions in hr_payroll_document.
+
+```mermaid
+classDiagram
+    class ir_attachment_payroll_custom
+    class hr_employee
+    class ir_attachment
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.