dev add monitoring basic

src/main/java/ru/soune/nocopy/dto/cost/CostResponse.java

@@ -0,0 +1,16 @@
+package ru.soune.nocopy.dto.cost;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.Builder;
+import lombok.Data;
+
+@Data
+@Builder
+public class CostResponse {
+    private int cost;
+
+    private Boolean success;
+
+    @JsonProperty("tokens_count")
+    private int needTokensCount;
+}