[Term Entry] Dart Type Conversion .toString() (Codecademy#4598)

* First Commit for toString() dart

* Update toString.md

* minor changes

* Updated toString.md

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Author: Vizhou19

content/dart/concepts/type-conversion/terms/toString/toString.md

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+---
+Title: '.toString()'
+Description: 'Converts the object into a string representation.'
+Subjects:
+  - 'Code Foundations'
+  - 'Computer Science'
+  - 'Mobile Development'
+Tags:
+  - 'Dart'
+  - 'Data Types'
+  - 'Method'
+  - 'Strings'
+CatalogContent:
+  - 'learn-dart'
+  - 'paths/computer-science'
+---
+
+In Dart, the **`.toString()`** method converts the object into a string representation.
+
+## Syntax
+
+```pseudo
+typeObject.toString()
+```
+
+Above, `typeObject.toString()` calls the `toString()` method on the object `typeObject`.
+
+## Example
+
+The following example demonstrates how the `.toString()` method is used to convert numbers to a string:
+
+```dart
+void main() {
+  int numbers = 123;
+  var result = numbers.toString();
+  print(result);
+}
+```
+
+The code shown above will generate the following output:
+
+```shell
+123
+```
+
+> **Note:** The output `123` is a string. This can be confirmed by checking `result is String` and `result.runtimeType`.