Created OTPCode (markdown)

OTPCode.md

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+Namespace: `SimpleOTP`
+
+Assembly: `SimpleOTP.dll`
+
+OTP code object model.
+```csharp
+public record OTPCode
+```
+
+## Constructors
+| Constructor | Description |
+| --- | --- |
+| [OTPCode()](https://github.com/XFox111/SimpleOTP/wiki/OTPCode.OTPCode) | Initializes a new instance of the `OTPCode` class. |
+| [OTPCode(int)](https://github.com/XFox111/SimpleOTP/wiki/OTPCode.OTPCode#OTPCodeint) | Initializes a new instance of the `OTPCode` class. |
+
+## Properties
+| Property | Type | Description |
+| --- | --- | --- |
+| `Code` | `Int32` | Gets or sets OTP code. |
+| `Expiring` | [DateTime?](https://docs.microsoft.com/en-us/dotnet/api/system.datetime?view=net-5.0) | Gets or sets date-time until the code is valid. |
+
+## Methods
+| Method | Description |
+| --- | --- |
+| [GetCode](https://github.com/XFox111/SimpleOTP/wiki/OTPCode.GetCode) | Gets valid 6 digit or more OTP code. |