Update README.md

README.md

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   - split: train
     path: data/train-*
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+
+### Dataset Description for MRXNW (Normalized Word Index)
+
+The MRXNW (Normalized Word Index) data is part of the UMLS (Unified Medical Language System) Metathesaurus, specifically available in the Rich Release Format (RRF). This dataset contains normalized words found in unique English-language Metathesaurus strings. It serves as an index facilitating efficient lookup and normalization of medical terms, supporting various applications in medical informatics and health-related software solutions.
+
+### Purpose
+
+The MRXNW dataset is designed to provide a structured index of normalized words from the UMLS Metathesaurus. It helps developers and researchers quickly identify and work with normalized forms of medical terms, thereby enhancing the accuracy and efficiency of information retrieval, natural language processing, and other applications requiring standardized medical vocabulary.
+
+### Column Descriptions
+
+#### LAT (Language Abbreviation)
+- **Description**: The abbreviation of the language of the string in which the word appears.
+- **Values**: The value is always `ENG` for English-language strings in this edition of the Metathesaurus.
+  - Example: `ENG`
+
+#### NWD (Normalized Word)
+- **Description**: The normalized word in lowercase.
+- **Values**: Alphanumeric strings representing normalized forms of words.
+  - Example: `anemia`
+
+#### CUI (Concept Unique Identifier)
+- **Description**: A unique identifier assigned to each concept within the UMLS Metathesaurus.
+- **Values**: Alphanumeric strings, such as `C0002871`. Each value uniquely identifies a medical concept.
+  - Example: `C0002871`
+
+#### LUI (Lexical Unique Identifier)
+- **Description**: A unique identifier for a term within the UMLS Metathesaurus.
+- **Values**: Alphanumeric strings, such as `L0002871`. Each value uniquely identifies a term.
+  - Example: `L0002871`
+
+#### SUI (String Unique Identifier)
+- **Description**: A unique identifier for a string within the UMLS Metathesaurus.
+- **Values**: Alphanumeric strings, such as `S0013742`. Each value uniquely identifies a string.
+  - Example: `S0013742`
+
+### Example Record
+
+```
+LAT:        ENG
+NWD:        anemia
+CUI:        C0002871
+LUI:        L0002871
+SUI:        S0013742
+```
+
+### Usage
+
+This dataset is primarily intended for developers and researchers working on medical informatics applications. It can be used to efficiently lookup and normalize medical terms, ensuring consistency and accuracy in information retrieval, natural language processing, and other applications that rely on standardized medical vocabulary.