feat: add child actions menu and achievements feature design

- Introduced a new feature specification for displaying a menu with actions (Award Certificate, Award Badge) when a child's card is clicked in ParentView.
- Created a detailed plan for an achievements system, outlining phases for implementation, including achievement taxonomy, MVP set, and UX considerations.
- Added a template for future feature specifications to standardize documentation.

specs/template/feat-template.md

@@ -0,0 +1,49 @@
+# Feature:
+
+## Overview
+
+**Goal:**
+
+**User Story:**
+
+**Rules:**
+
+---
+
+## Data Model Changes
+
+### Backend Model
+
+### Frontend Model
+
+---
+
+## Backend Implementation
+
+## Backend Tests
+
+- [ ]
+
+---
+
+## Frontend Implementation
+
+## Frontend Tests
+
+- [ ]
+
+---
+
+## Future Considerations
+
+---
+
+## Acceptance Criteria (Definition of Done)
+
+### Backend
+
+- [ ]
+
+### Frontend
+
+- [ ]