docs: add docstring for llm.rs (#267)

lib/bindings/python/rust/llm.rs

@@ -13,6 +13,29 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+/// This module provides a high-performance interface that bridges Python
+/// applications with the Rust-powered Dynamo LLM runtime.
+///
+/// It is organized into several specialized sub-modules, each responsible for a particular aspect of the system:
+///
+/// - `backend`:
+///   Wraps low-level interfaces for LLM inference, manages resource allocation,
+///   and integrates with specialized hardware for optimized execution.
+/// - `disagg_route`:
+///   Implements distributed routing of inference requests with dynamic
+///   load balancing and efficient resource allocation across clusters.
+/// - `kv`:
+///   Implements a high-performance key-value caching system that stores
+///   intermediate computations and maintains model state for rapid data access.
+/// - `model_card`:
+///   Manages model deployment cards containing detailed metadata, configuration
+///   settings, and versioning information to ensure consistent deployments.
+/// - `preprocessor`:
+///   Provides utilities for transforming raw LLM requests—including tokenization,
+///   prompt formatting, and validation—into a format required by the Dynamo runtime.
+///
+/// Each sub-module is designed to encapsulate its functionality for clean
+/// integration between Python tools and the Dynamo runtime.
 use super::*;
 
 pub mod backend;