added corsheaders

src/users/get_all_users.cpp

@@ -2,6 +2,7 @@
 
 // function for get all users data without password
 void get_all_users(const httplib::Request& request, httplib::Response& response) {
+    response.set_header("Access-Control-Allow-Origin", "*");
     if (request.body == "") {response.set_content("{\"required\":\"[token]\"}", "application/json");return;}
     nlohmann::json json_body = nlohmann::json::parse(request.body);