Kotlin: Add release notes

Author: igfoo

java/ql/lib/change-notes/2022-05-09-kotlin.md

@@ -0,0 +1,67 @@
+---
+category: feature
+---
+ * A number of new classes and methods related to the upcoming Kotlin
+   support have been added. These are not yet stable, as Kotlin support
+   is still under development.
+   * `File::isSourceFile`
+   * `File::isJavaSourceFile`
+   * `File::isKotlinSourceFile`
+   * `Member::getKotlinType`
+   * `Element::isCompilerGenerated`
+   * `Expr::getKotlinType`
+   * `LambdaExpr::isKotlinFunctionN`
+   * `Callable::getReturnKotlinType`
+   * `Callable::getParameterKotlinType`
+   * `Method::isLocal`
+   * `Method::getKotlinName`
+   * `Field::getKotlinType`
+   * `Modifiable::isSealedKotlin`
+   * `Modifiable::isInternal`
+   * `Variable::getKotlinType`
+   * `LocalVariableDecl::getKotlinType`
+   * `Parameter::getKotlinType`
+   * `Parameter::isExtensionParameter`
+   * `Compilation` class
+   * `Diagnostic` class
+   * `KtInitializerAssignExpr` class
+   * `ValueEQExpr` class
+   * `ValueNEExpr` class
+   * `ValueOrReferenceEqualsExpr` class
+   * `ValueOrReferenceNotEqualsExpr` class
+   * `ReferenceEqualityTest` class
+   * `CastingExpr` class
+   * `SafeCastExpr` class
+   * `ImplicitCastExpr` class
+   * `ImplicitNotNullExpr` class
+   * `ImplicitCoercionToUnitExpr` class
+   * `UnsafeCoerceExpr` class
+   * `PropertyRefExpr` class
+   * `NotInstanceOfExpr` class
+   * `ExtensionReceiverAccess` class
+   * `WhenExpr` class
+   * `WhenBranch` class
+   * `ClassExpr` class
+   * `StmtExpr` class
+   * `StringTemplateExpr` class
+   * `NotNullExpr` class
+   * `TypeNullPointerException` class
+   * `KtComment` class
+   * `KtCommentSection` class
+   * `KotlinType` class
+   * `KotlinNullableType` class
+   * `KotlinNotnullType` class
+   * `KotlinTypeAlias` class
+   * `Property` class
+   * `DelegatedProperty` class
+   * `ExtensionMethod` class
+   * `KtInitializerNode` class
+   * `KtLoopStmt` class
+   * `KtBreakContinueStmt` class
+   * `KtBreakStmt` class
+   * `KtContinueStmt` class
+   * `ClassObject` class
+   * `CompanionObject` class
+   * `LiveLiteral` class
+   * `LiveLiteralMethod` class
+   * `CastConversionContext` renamed to `CastingConversionContext`