Added an Article type.

pkg/article/article.go

@@ -0,0 +1,32 @@
+package article
+
+import (
+	"bytes"
+	"errors"
+	"time"
+)
+
+type Article struct {
+	Title       string
+	Date        time.Time
+	Description string
+	Body        []byte
+}
+
+func (artcl *Article) ParseMetadata(data []byte) error {
+	lines := bytes.Split(data, []byte{'\n'})
+	if len(lines) != 3 {
+		return errors.New("metadata file is not complete")
+	}
+
+	artcl.Title = string(lines[0])
+	date, err := time.Parse("02 01 2006", string(lines[1]))
+	if err != nil {
+		return err
+	}
+	artcl.Date = date
+
+	artcl.Description = string(lines[2])
+
+	return nil
+}