[ADD] point_of_sale: documentation to configure razorpay terminal

[sjai-odoo]

This PR add the documentation needed to use razorpay payment method in Point Of Sale.

task- 3762059

[robodoo]

Pull request status dashboard.

[sjai-odoo]

@paso-odoo All the suggested changes are done Thank you

[qle-odoo]

target 17.0 ?

[sjai-odoo]

Hello @qle-odoo ,

Up to version 17.1, we had the option to directly select the terminal. However, starting from version 17.2 and subsequent versions, we now offer the choice between integrating with a terminal or using a QR code.

v-17.1

v-17.2 and subsequent versions

Therefore, we have included both options in the documentation to ensure that customers are not misled. So we have created this in master after discussion with @mog-odoo

What's your call ?

Thank you.

[sjai-odoo]

@qle-odoo Branch retargeted to 17.0 Can you please check again Thank you

[qle-odoo]

@LoredanaLrpz can you review this please

[LoredanaLrpz]

@robodoo r+