api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/commenter_new.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"time"
+)
+
+func commenterNew(email string, name string, link string, photo string, provider string) (string, error) {
+	if email == "" || name == "" || link == "" || photo == "" || provider == "" {
+		return "", errorMissingField
+	}
+
+	commenterHex, err := randomHex(32)
+	if err != nil {
+		return "", errorInternal
+	}
+
+	statement := `
+		INSERT INTO
+		commenters (commenterHex, email, name, link, photo, provider, joinDate)
+		VALUES     ($1,           $2,    $3,   $4,   $5,    $6,       $7      );
+	`
+	_, err = db.Exec(statement, commenterHex, email, name, link, photo, provider, time.Now().UTC())
+	if err != nil {
+		return "", errorInternal
+	}
+
+	return commenterHex, nil
+}