You can also configure your SSL in xampp/apache/conf/extra/httpd-vhost.conf
like this:
<VirtualHost *:443>
DocumentRoot C:/xampp/htdocs/yourProject
ServerName yourProject.whatever
SSLEngine on
SSLCertificateFile "conf/ssl.crt/server.crt"
SSLCertificateKeyFile "conf/ssl.key/server.key"
</VirtualHost>