Initial commit: Pos packages

odoo-bringout-oca-ocb-pos_mercury/doc/MODELS.md

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+# Models
+
+Detected core models and extensions in pos_mercury.
+
+```mermaid
+classDiagram
+    class pos_mercury_configuration
+    class pos_mercury_mercury_transaction
+    class barcode_rule
+    class pos_order
+    class pos_payment
+    class pos_payment_method
+    class pos_session
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.