Create numericvalidator.md

Author: gsilvamartin

docs/docs/validators/numericvalidator.md

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+# NumericValidator Class
+
+**A static class containing numeric validation methods.**
+
+## Class Members
+
+```csharp
+IsPositive<T>(this T input)
+```
+
+Determines whether the specified value is positive.
+
+### Type Parameters
+
+- `T`: The type of the input value.
+
+### Returns
+
+- Type: `bool`
+- Description: `true` if the specified value is positive; otherwise, `false`.
+
+### Example
+
+```csharp
+int positiveNumber = 5;
+bool isPositive = positiveNumber.IsPositive(); // Returns true
+```
+
+---
+
+```csharp
+IsNegative<T>(this T input)
+```
+
+Determines whether the specified value is negative.
+
+### Type Parameters
+
+- `T`: The type of the input value.
+
+### Returns
+
+- Type: `bool`
+- Description: `true` if the specified value is negative; otherwise, `false`.
+
+### Example
+
+```csharp
+int negativeNumber = -3;
+bool isNegative = negativeNumber.IsNegative(); // Returns true
+```
+
+---
+
+```csharp
+IsZero<T>(this T input)
+```
+
+Determines whether the specified value is zero.
+
+### Type Parameters
+
+- `T`: The type of the input value.
+
+### Returns
+
+- Type: `bool`
+- Description: `true` if the specified value is zero; otherwise, `false`.
+
+### Example
+
+```csharp
+int zeroNumber = 0;
+bool isZero = zeroNumber.IsZero(); // Returns true
+```
+
+---
+
+### Remarks
+
+The `NumericValidator` class also contains several other methods for numeric validation, such as `IsEven`, `IsOdd`, `IsBetween`, and `IsPrime`. These methods provide additional ways to validate numeric values. For more information and examples of how to use these methods, please refer to the API reference documentation.