feat: CurrencyExchangeRequest with validator and validator's tests outline

src/main/java/eu/ztsh/wymiana/validation/ValidExchangeRequest.java

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+package eu.ztsh.wymiana.validation;
+
+import jakarta.validation.Constraint;
+import jakarta.validation.Payload;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import static java.lang.annotation.ElementType.TYPE_USE;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+
+@Retention(RUNTIME)
+@Target({ TYPE_USE })
+@Documented
+@Constraint(validatedBy = {ValidExchangeRequestValidator.class })
+public @interface ValidExchangeRequest {
+
+    String message() default "Exchange request is not valid";
+    Class<?>[] groups() default { };
+    Class<? extends Payload>[] payload() default { };
+
+}

src/main/java/eu/ztsh/wymiana/validation/ValidExchangeRequestValidator.java

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+package eu.ztsh.wymiana.validation;
+
+import eu.ztsh.wymiana.web.model.CurrencyExchangeRequest;
+import jakarta.validation.ConstraintValidator;
+import jakarta.validation.ConstraintValidatorContext;
+
+public class ValidExchangeRequestValidator implements ConstraintValidator<ValidExchangeRequest, CurrencyExchangeRequest> {
+
+    @Override
+    public boolean isValid(CurrencyExchangeRequest currencyExchangeRequest,
+                           ConstraintValidatorContext constraintValidatorContext) {
+        return false;
+    }
+
+}

src/main/java/eu/ztsh/wymiana/web/model/CurrencyExchangeRequest.java

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+package eu.ztsh.wymiana.web.model;
+
+import eu.ztsh.wymiana.validation.ValidExchangeRequest;
+import jakarta.validation.constraints.NotNull;
+import lombok.Builder;
+import org.hibernate.validator.constraints.pl.PESEL;
+
+@Builder
+@ValidExchangeRequest
+public record CurrencyExchangeRequest(
+    @PESEL String pesel,
+    @NotNull String from,
+    @NotNull String to,
+    Double toBuy,
+    Double toSell
+) {
+
+}