feat(templates/shared): Add base HTML template with Tailwind CSS and dark theme

This commit introduces the foundational `base.html` template, setting up the common structure and styling for shared templates across the application.

- **New Features**
    - Initial `base.html` template for consistent page structure.
    - Integration of Tailwind CSS for modern and utility-first styling.
    - Default application-wide dark theme enabled.
    - Defined `content` block for inheritance by child templates.
    - Configured a responsive container (`container mx-auto px-4`) for main content.

templates/shared/base.html

@@ -0,0 +1,16 @@
+
+<!DOCTYPE html>
+{% load tailwind_cli %}
+<html lang="en" data-theme="dark">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>My Django App</title>
+    {% tailwind_css %}
+</head>
+<body class="bg-base-200">
+    <div class="container mx-auto px-4">
+        {% block content %}{% endblock %}
+    </div>
+</body>
+</html>