Add Exception to describe non-200 responses.

Author: BeauneNuits

src/main/java/fr/rabian/ovhApi/core/utils/NOKResponseException.java

@@ -0,0 +1,12 @@
+package fr.rabian.ovhApi.core.utils;
+
+import java.io.IOException;
+
+/**
+ * @author Adrien Rabian
+ */
+public class NOKResponseException extends IOException {
+    public NOKResponseException(int responseCode) {
+        super("HTTP response code " + responseCode + " encountered.");
+    }
+}