Create customer

[Frank-readresolve]

A customer should be able to request for an account creation with the following information:

• First and last names: required, maximum of 200 characters
• Company name: required, maximum of 200 characters
• Company size: required, one of "Less than 1000", "From 1000 to 10000" and "More than 10000"
• Email: required
• Phone number: required
• Number of developers: required, one of "Less than 200", "From 200 to 1000" and "More than 1000"
• Role in the company: optional, maximum of 50 characters
• Message: required, maximum of 2000 characters

Note that the selected values for "Company size" and "Number of developers" should be consistent