Create stringvalidator.md

Author: gsilvamartin

docs/docs/validators/stringvalidator.md

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+# StringValidator Class
+
+**A static class containing string validation methods.**
+
+## Class Members
+
+```csharp
+IsDate(this string input)
+```
+
+Determines whether the specified string is a valid date.
+
+### Parameters
+
+- `input`: The input string.
+
+### Returns
+
+- Type: `bool`
+- Description: `true` if the specified string is a valid date; otherwise, `false`.
+
+### Example
+
+```csharp
+string dateString = "2022-01-01";
+bool isValidDate = dateString.IsDate(); // Returns true
+```
+
+---
+
+```csharp
+IsDateTime(this string input)
+```
+
+Determines whether the specified string is a valid date and time.
+
+### Parameters
+
+- `input`: The input string.
+
+### Returns
+
+- Type: `bool`
+- Description: `true` if the specified string is a valid date and time; otherwise, `false`.
+
+### Example
+
+```csharp
+string dateTimeString = "2022-01-01 12:00:00";
+bool isValidDateTime = dateTimeString.IsDateTime(); // Returns true
+```
+
+---
+
+```csharp
+IsUnicode(this string input)
+```
+
+Determines whether the specified string contains Unicode characters.
+
+### Parameters
+
+- `input`: The input string.
+
+### Returns
+
+- Type: `bool`
+- Description: `true` if the specified string contains Unicode characters; otherwise, `false`.
+
+### Example
+
+```csharp
+string unicodeString = "こんにちは";
+bool isUnicode = unicodeString.IsUnicode(); // Returns true
+```
+
+### Remarks
+
+The `StringValidator` class also contains several other methods for string validation, such as `IsEmail`, `IsUrl`, `IsPhoneNumber`, and `IsPostalCode`. These methods provide additional ways to validate string values. For more information and examples of how to use these methods, please refer to the API reference documentation.