Enhance DeesToast component with new features and improved demo

- Updated README to reflect new toast positions and convenience methods.
- Expanded demo functionality to showcase various toast types, positions, and durations.
- Added programmatic control for toast dismissal and multiple toast notifications.
- Introduced new toast positions: top-center and bottom-center.
- Implemented a progress bar for auto-dismiss functionality.
- Improved styling and animations for better user experience.

readme.md

@@ -104,7 +104,7 @@ Loading indicator with customizable appearance.
 ```
 
 #### `DeesToast`
-Notification toast messages with various styles and auto-dismiss.
+Notification toast messages with various styles, positions, and auto-dismiss functionality.
 
 ```typescript
 // Programmatic usage
@@ -112,18 +112,43 @@ DeesToast.show({
   message: 'Operation successful',
   type: 'success',      // Options: info, success, warning, error
   duration: 3000,       // Time in milliseconds before auto-dismiss
-  position: 'top-right' // Options: top-right, top-left, bottom-right, bottom-left
+  position: 'top-right' // Options: top-right, top-left, bottom-right, bottom-left, top-center, bottom-center
 });
 
-// Component usage
+// Convenience methods
+DeesToast.info('Information message');
+DeesToast.success('Success message');
+DeesToast.warning('Warning message');
+DeesToast.error('Error message');
+
+// Advanced control
+const toast = await DeesToast.show({
+  message: 'Processing...',
+  type: 'info',
+  duration: 0  // No auto-dismiss
+});
+
+// Later dismiss programmatically
+toast.dismiss();
+
+// Component usage (not typically used directly)
 <dees-toast
   message="Changes saved"
   type="success"
-  autoClose
   duration="3000"
 ></dees-toast>
 ```
 
+Key Features:
+- Multiple toast types with distinct icons and colors
+- 6 position options for flexible placement
+- Auto-dismiss with visual progress indicator
+- Manual dismiss by clicking
+- Smooth animations and transitions
+- Automatic stacking of multiple toasts
+- Theme-aware styling
+- Programmatic control
+
 ### Form Components
 
 #### `DeesForm`