Hi,
You'll need to develop a custom Web Service (WCF) to interact with Dynamics CRM and make your Wordpress call the custom Web Service. So it will be something like :
1. Wordpress call Custom WCF Service with all contact data.
2. WCF Service receives data and calls Dynamics CRM Service to create a Contact.
This is a one way flow though.
Admin QuikView Solution for CRM 2013