No. You could say "If you e-mail me or send me a text, I will have your contact information."
Can you say this:
If I know you email or text me and I'll add you.
In my opinion, no you can't . You can say " Email me or text me, and if I know you, I'll add you".
Not a teacher
If you add a comma near the start, it's fine.
"If I know you, send me an email or a text and I'll add you."
It sounds like the kind of message you would send someone who is looking for an invite to a social network. Some of them require an existing member to invite new members and they ask that existing members only give those invites to people they know personally.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
... and emsr2d2's post shows how important it is to use correct punctuation.