add anketa/adults page

[k-boiko]

https://programming.org.ua/ua/anketa/adults

User is navigated to this page after submitting first anketa step in case if his/her age >= 17.

• render all input fields
• add validation
• display preview of uploaded image
• submit form to backend
• handle errors from backend
• navigate user to last step of anketa after submitting this

[ihor-bobyr]

write all fields(except image) to local storage to show this info later on this page if user refresh it and to show email later on this page - #53