Add docs for Dart .removeFirst()

content/dart/concepts/queue/terms/removeFirst/removeFirst.md

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+---
+Title: '.removeFirst()'
+Description: 'Removes and returns the first element from a queue.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+Tags:
+  - 'Dart'
+  - 'Methods'
+  - 'Queues'
+CatalogContent:
+  - 'learn-dart'
+  - 'paths/computer-science'
+---
+
+The **`.removeFirst()`** method in Dart is used to remove and return the first element from a `Queue`.
+
+## Syntax
+
+```pseudo
+E removeFirst()
+```
+
+**Parameters:**
+
+None.
+
+**Return value:**
+
+This method returns the first element (`E`) in the queue.
+
+> **Note:** Calling this method on an empty queue will throw a `StateError`.
+
+## Example
+
+In the following example, the first element is removed from the queue using the `.removeFirst()` method:
+
+```dart
+import 'dart:collection';
+
+void main() {
+  // Creating a queue
+  Queue<int> queue = Queue.from([1, 2, 3, 4, 5]);
+
+  // Print the original queue
+  print('Original Queue: $queue');
+
+  // Remove the first element
+  int removedElement = queue.removeFirst();
+  print('Removed Element: $removedElement');
+
+  // Print the modified queue
+  print('Modified Queue: $queue');
+}
+```
+
+The above code results in the following output:
+
+```shell
+Original Queue: {1, 2, 3, 4, 5}
+Removed Element: 1
+Modified Queue: {2, 3, 4, 5}
+```