Create migrating-to-v4.1.md

docs/en/migration-guides/migrating-to-v4.1.md

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+# Migrating to v4.0
+
+InputKit version 4.1 is a major release. It has many new features and improvements. Some of them makes breaking-changes.
+
+## What's new?
+Validation logic is changed completely. Most of properties are removed and validation classes are added. You can read more about it [here](../components/controls/FormView.md#validations).
+
+## Breaking changes
+
+Validation is a cross-cutting concern, so lots of components are affected by this change. You should take action if you're using any of them.
+
+### CheckBox
+
+- `IsRequired` is removed
+- `IsValidated` is renamed to IsValid
+- `ValidationMessage` is removed
+
+    New usage is like below:
+    ```xml
+    <input:Checkbox>
+        <input:Checkbox.Validation>
+            <input:RequiredValidation Message="This field is required." />
+        </input:Checkbox.Validation>
+    </input:Checkbox>
+    ```
+
+### RadioButton
+- `IsRequired` is removed
+- `IsValidated` is renamed to IsValid
+- `ValidationMessage` is removed
+
+    New usage is like below:
+    ```xml
+    <input:Checkbox>
+        <input:Checkbox.Validation>
+            <input:RequiredValidation Message="This field is required." />
+        </input:Checkbox.Validation>
+    </input:Checkbox>
+    ```
+
+### AdvancedEntry
+- `IsRequired` is removed
+- `IsValidated` is renamed to IsValid
+- `Annotation` is removed
+- `ValidationMessage` is removed
+- `IsAnnotated` is removed
+- `AnnotationColor` is renamed as ValidationColor
+- `UpdateKeyboard()` method is removed
+- `MinLength` is removed.
+- `RegexPattern` is removed.
+- `IgnoreValidationMessage`
+- `ValidationChanged` event is removed.
+- `Clicked` event is removed.
+- `Nullable` is removed
+
+Visit [Validations documentation](../components/controls/FormView.md#validations) for new usage information..