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requirements.md

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+# Simple Todo Application - Requirements
+
+## Functional Requirements
+
+### REQ-001: Create Todo Items
+The application shall allow users to create new todo items with a title and optional description.
+
+### REQ-002: List Todo Items
+The application shall display all created todo items in a list format with their current status.
+
+### REQ-003: Mark Todo as Complete
+The application shall provide functionality to mark a todo item as complete or incomplete with a toggle action.
+
+### REQ-004: Delete Todo Items
+The application shall allow users to delete todo items from the list permanently.
+
+### REQ-005: Edit Todo Items
+The application shall allow users to edit the title and description of existing todo items.
+
+## Non-Functional Requirements
+
+### REQ-006: Data Persistence
+The application shall persist all todo items to a JSON file so that data remains available after application restart.
+
+### REQ-007: Input Validation
+The application shall validate that todo titles are not empty and are no longer than 200 characters.
+
+### REQ-008: Performance
+The application shall complete all todo operations (create, read, update, delete) within 100 milliseconds.
+
+### REQ-009: Code Quality
+The application shall implement proper error handling with descriptive error messages for all operations.
+
+### REQ-010: User Interface
+The application shall provide a simple command-line interface with clear menu options and status feedback for user actions.