Properly link flecs library

engine/libs/flecs/examples/cpp/reflection/basics_json/src/main.cpp

@@ -0,0 +1,39 @@
+#include <basics_json.h>
+#include <iostream>
+
+struct Position {
+    float x;
+    float y;
+};
+
+int main(int, char *[]) {
+    flecs::world ecs;
+
+    // Register component with reflection data
+    ecs.component<Position>()
+        .member<float>("x")
+        .member<float>("y");
+
+    // Create entity with Position as usual
+    flecs::entity e = ecs.entity("ent")
+        .set<Position>({10, 20});
+
+    // Convert position component to JSON string
+    const Position *ptr = e.get<Position>();
+    std::cout << ecs.to_json(ptr) << "\n"; // {"x":10, "y":20}
+
+    // Convert entity to JSON
+    flecs::entity_to_json_desc_t desc;
+    desc.serialize_path = true;
+    desc.serialize_values = true;
+    std::cout << e.to_json(&desc) << "\n";
+
+    // {
+    //     "path":"ent", 
+    //     "ids":[["Position"]], 
+    //     "values":[{
+    //         "x":10, 
+    //         "y":20
+    //     }]
+    // }
+}