add missing src/entitlement.mjs from template

src/entitlement.mjs

@@ -0,0 +1,22 @@
+/**
+ * @param {string|Object} data
+ */
+export class Entitlement {
+  constructor(data) {
+    if (typeof data === "string") {
+      Object.defineProperties(this, { name: { value: data } });
+    } else {
+      Object.assign(this, data);
+    }
+
+    this.id = this.name;
+  }
+
+  get name() {
+    return Array.isArray(this.cn) ? this.cn[0] : this.cn;
+  }
+
+  get displayName() {
+    return this.name;
+  }
+}