feat: add relational document system specification and plan

specs/001-create-a-neovim/data-model.md

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+# Data Model: Relational Document System
+
+This document outlines the key entities for the relational document system.
+
+## Entities
+
+### Document
+- **Description**: A markdown file with YAML frontmatter.
+- **Attributes**:
+  - `type` (string): The type of the document (e.g., "person", "meeting").
+  - `properties` (object): A set of key-value pairs defined in the YAML frontmatter.
+
+### Schema
+- **Description**: A definition for a document type, specifying its properties and their types. As per the clarification, schemas are not strictly enforced but are inferred from existing documents.
+- **Attributes**:
+  - `name` (string): The name of the document type.
+  - `properties` (object): A dictionary of property names and their inferred types (e.g., string, number, date).
+
+### Query
+- **Description**: A definition in a custom block syntax that filters and sorts documents.
+- **Attributes**:
+  - `document_type` (string): The type of document to query.
+  - `filters` (array): A list of filter conditions (e.g., `property == value`).
+  - `sort_by` (array): A list of properties to sort the results by.
+
+### View
+- **Description**: A virtual buffer that displays the results of a query.
+- **Attributes**:
+  - `query` (Query): The query that generated the view.
+  - `documents` (array): A list of documents that match the query.