trigger - email sent for new contact

I want to write a trigger on Contact , when a contact insert an email should be sent to contact email id.

I have written the below code and when I try to create a new contact, contact is not receiving an email. Can anyone help me.

trigger conss on Contact (before insert) {
set<id> conlist = new set<id>();
for(contact cons : trigger.new){
conlist.add(cons.id);
   }
public static void emailsent(){
list<Messaging.SingleEmailMessage> maillist = new list<Messaging.SingleEmailMessage>();
EmailTemplate et = [select id,
subject,
body from EmailTemplate where DeveloperName = 'contact_test' ];
contact cont = [select id,email from contact where id in : conlist];
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage ();
mail.setTemplateId(et.id);
mail.setTargetObjectId(cont.Id);
maillist.add(mail);

if(!maillist.isEmpty()){
Messaging.sendEmail(maillist);
}
   }

}