#1: Pull queue into struct, add storage interface

api/mojang/queue/storage.go

@@ -0,0 +1,19 @@
+package queue
+
+import "github.com/elyby/chrly/api/mojang"
+
+type Storage interface {
+	Get(username string) *mojang.SignedTexturesResponse
+	Set(textures *mojang.SignedTexturesResponse)
+}
+
+// NilStorage used for testing purposes
+type NilStorage struct {
+}
+
+func (*NilStorage) Get(username string) *mojang.SignedTexturesResponse {
+	return nil
+}
+
+func (*NilStorage) Set(textures *mojang.SignedTexturesResponse) {
+}