After plugin installation according to instructions in the readme I get the following error:

mail(): "sendmail_from" not set in php.ini or custom "From:" header missing [2]
triggered in file C:\Apache24\htdocs\dudepls\plugins\siezi\phileContactForm\Classes\Plugin.php on line 135.

Solution: check php.ini for correct email configuration

It is not clear to me where to add the line (contact-form: simple) to insert the form.
Is it supposed to be in the .md or in the theme file? Where exactly?
Running Phile 1.6

Solution: (contact-form: simple) must be in the content of the page and {{ content }} must be declared in the theme template used by the page.

Hello Developers,

so no spam is sent, I would like to use something with Captcha. How can I realize it with the contact form or it goes also with Google ReCaptcha, if that is possible.

Then I hope you are still here.

Thanks in advance.