INTPYTHON-571 Add MongoDBDocStore to Readme (#114)

Author: blink1073

README.md

@@ -14,32 +14,35 @@ It contains the following packages.
 
 ### LangChain
 
-- Vector store
+- Vector store (VectorStore)
     -[MongoDBAtlasVectorSearch](https://python.langchain.com/docs/integrations/vectorstores/mongodb_atlas/)
-- Message histories
+- Message histories (BaseChatMessageHistory)
     - [MongoDBChatMessageHistory](https://python.langchain.com/docs/integrations/memory/mongodb_chat_message_history/)
-- Model caches
+- Model caches (BaseCache)
     - [MongoDBCache](https://python.langchain.com/docs/integrations/providers/mongodb_atlas/#mongodbcache)
     - [MongoDBAtlasSemanticCache](https://python.langchain.com/docs/integrations/providers/mongodb_atlas/#mongodbatlassemanticcache)
-- Retrievers
+- Retrievers (BaseRetriever)
     - [MongoDBAtlasHybridSearchRetriever](https://python.langchain.com/docs/integrations/providers/mongodb_atlas/#hybrid-search-retriever)
     - [MongoDBAtlasFullTextSearchRetriever](https://python.langchain.com/docs/integrations/providers/mongodb_atlas/#full-text-search-retriever)
     - [MongoDBAtlasParentDocumentRetriever](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/retrievers/langchain_mongodb.retrievers.parent_document.MongoDBAtlasParentDocumentRetriever.html#langchain_mongodb.retrievers.parent_document.MongoDBAtlasParentDocumentRetriever)
     - [MongoDBAtlasSelfQueryRetriever](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/retrievers/langchain_mongodb.retrievers.self_querying.MongoDBAtlasSelfQueryRetriever.html).
-- Indexing
+- Indexing (RecordManager)
     - [MongoDBRecordManager](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/indexes/langchain_mongodb.indexes.MongoDBRecordManager.html#langchain_mongodb.indexes.MongoDBRecordManager)
-- Loading
+- Loading (BaseLoader)
     - [MongoDBLoader](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/loaders/langchain_mongodb.loaders.MongoDBLoader.html#langchain_mongodb.loaders.MongoDBLoader)
+- https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/docstores/langchain_mongodb.docstores.MongoDBDocStore.html#langchain_mongodb.docstores.MongoDBDocStore
+- Key-Value Store (BaseStore)
+    - [MongoDBDocStore](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/docstores/langchain_mongodb.docstores.MongoDBDocStore.html#langchain_mongodb.docstores.MongoDBDocStore)
 - GraphRAG
     - [MongoDBGraphStore](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/graphrag/langchain_mongodb.graphrag.graph.MongoDBGraphStore.html)
-- Agent Toolkit
+- Agent Toolkit (BaseToolkit)
     - [MongoDBDatabase](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/agent_toolkit/langchain_mongodb.agent_toolkit.database.MongoDBDatabase.html#langchain_mongodb.agent_toolkit.database.MongoDBDatabase)
     - [MongoDBDatabaseToolkit](https://langchain-mongodb.readthedocs.io/en/latest/langchain_mongodb/agent_toolkit/langchain_mongodb.agent_toolkit.toolkit.MongoDBDatabaseToolkit.html)
 
 
 ### LangGraph
 
-- Checkpointing
+- Checkpointing (BaseCheckpointSaver)
     - [MongoDBSaver](https://langchain-mongodb.readthedocs.io/en/latest/langgraph_checkpoint_mongodb/checkpoint/langgraph.checkpoint.mongodb.saver.MongoDBSaver.html#langgraph.checkpoint.mongodb.saver.MongoDBSaver)
     - [AsyncMongoDBSaver](https://langchain-mongodb.readthedocs.io/en/latest/langgraph_checkpoint_mongodb/checkpoint/langgraph.checkpoint.mongodb.aio.AsyncMongoDBSaver.html)