Add quit command

Change-Id: Ia0a01a558ec92bb0d8f22fe2fbddf74b8d78242b
diff --git a/src/interpreter.hpp b/src/interpreter.hpp
index 36c9388..f2cfd11 100644
--- a/src/interpreter.hpp
+++ b/src/interpreter.hpp
@@ -33,6 +33,7 @@
     void operator()(const exec_& exec) const;
     void operator()(const cancel_& cancel) const;
     void operator()(const switch_& switch_cmd) const;
+    void operator()(const quit_&) const;
 
 private:
     [[nodiscard]] std::string buildTypeInfo(const std::string& path) const;