added dart language,category,snippets

Added Dart Snippets
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categories such as:
array-manipulation,
file-manipulation,
string-manipulation,
date-and-time

Author: Vrindtime

snippets/dart/array-manipulation/even-filter.md

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+---
+title: Filter a List
+description: Filters a list to include only even numbers.
+author: Vrindtime
+tags: dart,collections,list,utility
+---
+
+```dart
+final numbers = [1, 2, 3, 4, 5, 6];
+final evens = numbers.where((n) => n.isEven).toList();
+print(evens); // Prints [2, 4, 6]
+```

snippets/dart/array-manipulation/find-index.md

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+---
+title: Find Index of an Element
+description: Finds and prints the index of a specific element in an array.
+author: Vrindtime
+tags: dart,array-manipulation,utility
+---
+
+```dart
+final numbers = [10, 20, 30, 40, 50];
+final index = numbers.indexOf(30);
+print(index); // Prints 2
+```

snippets/dart/array-manipulation/max-value.md

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+---
+title: Find Maximum in an Array
+description: Finds and prints the maximum value in an array.
+author: Vrindtime
+tags: dart,array-manipulation,utility
+---
+
+```dart
+final numbers = [3, 7, 2, 9, 4];
+final maxNumber = numbers.reduce((a, b) => a > b ? a : b);
+print(maxNumber); // Prints 9
+```

snippets/dart/array-manipulation/remove-duplicate.md

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+---
+title: Remove Duplicates from an Array
+description: Removes duplicate elements from an array and prints the result.
+author: Vrindtime
+tags: dart,array-manipulation,utility
+---
+
+```dart
+final numbers = [1, 2, 2, 3, 4, 4, 5];
+final uniqueNumbers = numbers.toSet().toList();
+print(uniqueNumbers); // Prints [1, 2, 3, 4, 5]
+```

snippets/dart/array-manipulation/remove-element.md

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+---
+title: Remove Specific Element from an Array
+description: Removes a specific element from an array and prints the result.
+author: Vrindtime
+tags: dart,array-manipulation,utility
+---
+
+```dart
+final numbers = [1, 2, 3, 4, 5];
+numbers.remove(3);
+print(numbers); // Prints [1, 2, 4, 5]
+```

snippets/dart/array-manipulation/reverse-array.md

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+---
+title: Reverse an Array
+description: Reverses an array and prints the result.
+author: Vrindtime
+tags: dart,array-manipulation,utility
+---
+
+```dart
+final numbers = [1, 2, 3, 4, 5];
+final reversed = numbers.reversed.toList();
+print(reversed); // Prints [5, 4, 3, 2, 1]
+```

snippets/dart/array-manipulation/shuffle-array.md

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+---
+title: Shuffle an Array
+description: Randomly shuffles the elements of an array and prints the result.
+author: Vrindtime
+tags: dart,array-manipulation,utility
+---
+
+```dart
+final numbers = [1, 2, 3, 4, 5];
+numbers.shuffle(Random());
+print(numbers); // Prints the array in random order
+```

snippets/dart/array-manipulation/sort-array.md

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+---
+title: Sort an Array
+description: Sorts an array in ascending order and prints it.
+author: Vrindtime
+tags: dart,array-manipulation,utility
+---
+
+```dart
+final numbers = [5, 1, 8, 3, 2];
+numbers.sort();
+print(numbers); // Prints [1, 2, 3, 5, 8]
+```

snippets/dart/basics/hello-world.md

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+---
+title: Hello, World!
+description: Prints Hello, World! to the terminal.
+author: Vrindtime
+tags: dart,printing,hello-world,utility
+---
+
+```dart
+print("Hello, World!"); // Prints Hello, World! to the console
+```

snippets/dart/date-and-time/add-duration.md

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+---
+title: Add Duration to DateTime
+description: Adds a specified duration to a DateTime object and prints the result.
+author: Vrindtime
+tags: dart,date-time,utility
+---
+
+```dart
+final now = DateTime.now();
+final future = now.add(Duration(days: 7,hours: 10,minutes: 5,seconds: 2,microseconds: 100,milliseconds: 50));
+print(future); // Prints the date and time 7 days, 10 hours, 5 minutes, 2 seconds, 100 microseconds and 50 miliseconds from now
+```