Added empty statement

src/Statement.h

@@ -0,0 +1,22 @@
+#ifndef STATEMENT_H
+#define STATEMENT_H
+
+#include <iostream>
+
+using namespace std;
+
+class Statement {
+public:
+    enum Kind {
+        INVALID
+    };
+
+private:
+    Kind kind;
+
+public:
+    Statement(Kind kind);
+    string toString();
+};
+
+#endif