Add e2e test
diff --git a/core/kg/app/interfaces.go b/core/kg/app/interfaces.go
new file mode 100644
index 0000000..53cb1aa
--- /dev/null
+++ b/core/kg/app/interfaces.go
@@ -0,0 +1,10 @@
+package app
+
+import "github.com/giolekva/pcloud/core/kg/log"
+
+type logger interface {
+	Debug(message string, fields ...log.Field)
+	Info(message string, fields ...log.Field)
+	Warn(message string, fields ...log.Field)
+	Error(message string, fields ...log.Field)
+}