A php from to make a rest call and add data to Espocrm

Only developers with REST, JSON and API experience. I need a php that uses an API to add data inside my software. We use a free simple opensource crm soft called EspoCRM, please download and test it. About api and rest is here [login to view URL] (You can learn how API works if you trace what's going in the network tab in your browser console.) I need an html form to add new contacts, leads, or prospects to my Espocrm. If you read this description add a text esporocks to your bid, if not, it will not be considered. So i need 3 things. 1. the html with form + .php that using REST and api call, adds the prospects inside Espocrm. 2. If all works fine, will show [login to view URL] , if something fail will show [login to view URL] with de error_log 3. a doc or wiki about how to modify the html or php if i create a new field inside espocrm, to be added in the html form+ api call.