✨ feat(core): add client and credential modules

- introduce client module for API interactions
- implement credential module for authentication

src/lib.rs

@@ -3,3 +3,11 @@
 #![cfg_attr(docsrs, feature(rustdoc_missing_doc_code_examples))]
 #![cfg_attr(docsrs, warn(rustdoc::invalid_codeblock_attributes))]
 #![doc = include_str!("../docs/lib.md")]
+
+mod client;
+mod credential;
+mod list;
+
+pub use client::get_auth;
+pub use client::get_client;
+pub use credential::Credential;