[cpp][tiny] rename generator, update samples (#9560)

* rename generator, update samples

* add doc

* update readme

samples/client/petstore/cpp-tiny/lib/service/Response.h

@@ -0,0 +1,25 @@
+#ifndef TINY_CPP_CLIENT_RESPONSE_H_
+#define TINY_CPP_CLIENT_RESPONSE_H_
+#include <string>
+
+namespace Tiny {
+
+/**
+*  Class
+* Generated with openapi::tiny-cpp-client
+*/
+template <typename T = std::string>
+    class Response {
+    public:
+
+    Response(T _obj, int _code){
+        obj = _obj;
+        code = _code;
+    }
+
+    int code;
+    T obj;
+    };
+    } // namespace Tinyclient
+    
+#endif /* TINY_CPP_CLIENT_RESPONSE_H_ */