Create Supplier page

[agneym]

This is page for cylinder supplier to generate unique QR codes for their cylinders.

It can be modelled after existing merchant page.

Fields:

• Name of the supplier (This is a creatable select, where user can either select an existing supplier or add new supplier. The supplier name is unique)
• Address - textarea
• Contact Phone number - tel

Note: if user preselects a name, rest of the fields are autofilled.

This leads to an API call with these details - classic upsert. Follow up by #20

[agneym]

@unnitallman