docs/01-create-twitter-app.md should mention that you need your Twitter account to be associated with an email address

[milancurcic]

What’s missing?

Signing up for a Twitter Developer Account (TDA) requires that an email address is associated with a Twitter account. This is not mentioned in the docs nor it's mentioned in the TDA application. You find out that you need it only when you get to the end, at which point you need to go and add an email address to your account, and then restart the application.

Why?

Mentioning upfront in the docs that you need an email address associated with the account would save you from doing the application twice.

Alternatives you tried

n/a

Suggestion

In Apply for a Developer Account section, the first paragraph says:

You might be asked to add a phone number to your twitter account before proceeding. If the phone number is used in another account, it won’t let you use it again. But you can remove the phone number from the other account. You can change it back once your developer account was approved.

it would be helpful to add a sentence like this or similar, to the end of the paragraph:

Your Twitter account will also need to be associated with an email address. If it isn't yet, do that first.

Would you like a PR?

[gr2m]

Absolutely, thank you Milan!