I'm NT and have autistic friends. It's not a big deal to me. I don't care about the diagnosis. I do care about who they are as human beings. But I'm pretty sure that I am not a "typical" neurotypical, either, because I have family members who are on the spectrum and I have tutored autistic students for years so I probably know a lot more about ASD than other people.
Go slow, get to know each other as friends, do some things together that both of you enjoy, and, if the friendship seems to be one can last a long time, then consider telling your friend that you have an ASD diagnosis. Your friend may already be aware of "differences" but doesn't feel close enough to you to ask about it.
Bear in mind that your friend also may have some issues which he has not (yet) disclosed to you. True friendship requires trust and respect.