add samples

wangrong

2025-03-19 291afb9c81aae1d15d9e3edcea618d0a2e1fc5a6

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#include "vp_placeholder_node.h" 
 
namespace vp_nodes { 
         
    vp_placeholder_node::vp_placeholder_node(std::string node_name): vp_node(node_name) { 
        this->initialized(); 
    } 
     
    vp_placeholder_node::~vp_placeholder_node() { 
        deinitialized(); 
    } 
}