How to Add a New Contact in Dynamics 365 using PHP

In a Joomla application I am getting a user info as follows and then I need to save the user info as a contact in a Dynamics 365 database through their REST API.

                    $user = JFactory::getUser();
                    $username = $user->username;
                    $name = $user->name;

I have looked up Dynamics documents around Web API and REST API like this and this, but none of them provide useful info how I can call the API to add a new contact. Currently, I am connecting to Dynamics 365 web application via this url: http://example.com:8088/mysite/api/data/v8.2. The linked post also talks about REST API, but only querying. I'm looking for a way to post data to Dynamics CRM using REST API.

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