docs: add docstring for isDevelopment

src/helpers/https-agent.helper.ts

@@ -1,3 +1,8 @@
+/**
+ * Checks if the current environment is development based on the NODE_ENV environment variable.
+ *
+ * @returns {boolean} `true` if `NODE_ENV` is set to `'development'`, otherwise `false`.
+ */
 export const isDevelopment = (): boolean => {
   return process.env.NODE_ENV == 'development' ? true : false;
 };