UserForm: ajout retour de validation d'API

frontend/src/errors/api.error.js

@@ -0,0 +1,21 @@
+export class APIError extends Error {
+	constructor(endpoint, code, message, data) {
+        super(`APIError: ${message}`);
+        this.endpoint = endpoint;
+        this.code = code;
+        this.data = data;
+		Error.captureStackTrace(this, APIError);
+    }
+
+    getEndpoint() {
+        return this.endpoint;
+    }
+
+    getCode() {
+        return this.code;
+    }
+    
+    getData() {
+        return this.data;
+    }
+}