feat: add Tags

Allows the user to get all tags so that they can use them for their own
purpose.

Author: Simon Prochazka

tags.go

@@ -0,0 +1,11 @@
+package git
+
+func (g *Git) Tags() ([]*Tag, error) {
+	tags, err := g.getTags()
+
+	if err != nil {
+		return nil, err
+	}
+
+	return tags, nil
+}