add show password button

enzevalos_iphone.xcodeproj/project.pbxproj

enzevalos_iphone/Assets.xcassets/passwordInput/Contents.json

...assets/passwordInput/ic_eye_closed.imageset/Contents.json

...ts/passwordInput/ic_eye_closed.imageset/ic_eye_closed.png

...passwordInput/ic_eye_closed.imageset/ic_eye_closed@2x.png

...passwordInput/ic_eye_closed.imageset/ic_eye_closed@3x.png

...xcassets/passwordInput/ic_eye_open.imageset/Contents.json

...assets/passwordInput/ic_eye_open.imageset/ic_eye_open.png

...ets/passwordInput/ic_eye_open.imageset/ic_eye_open@2x.png

...ets/passwordInput/ic_eye_open.imageset/ic_eye_open@3x.png

...asswordInput/ic_password_checkmark.imageset/Contents.json

.../ic_password_checkmark.imageset/ic_password_checkmark.png

..._password_checkmark.imageset/ic_password_checkmark@2x.png

..._password_checkmark.imageset/ic_password_checkmark@3x.png

enzevalos_iphone/HideShowPasswordTextField.swift

enzevalos_iphone/Onboarding.swift

enzevalos_iphone/PasswordToggleVisibilityView.swift