Update Abp-5_0.md

docs/en/Migration-Guides/Abp-5_0.md

@@ -1,5 +1,33 @@
 # ABP Framework v4.x to v5.0 Migration Guide
 
+## IdentityUser
+
+We added an `IsActive(bool)` property to `IdentityUser` to [control whether it is available](https://github.com/abpframework/abp/pull/10185). **Please set it to `true` of the old user after the upgrade.**
+
+For EF Core you can change `defaultValue` to `true` in the migration class:
+```cs
+public partial class AddIsActiveToIdentityUser : Migration
+{
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.AddColumn<bool>(
+            name: "IsActive",
+            table: "AbpUsers",
+            type: "bit",
+            nullable: false,
+            defaultValue: true); // Default is false.
+    }
+
+    protected override void Down(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.DropColumn(
+            name: "IsActive",
+            table: "AbpUsers");
+    }
+}
+```
+
+
 ## MongoDB
 
 ABP Framework will serialize the datetime based on [AbpClockOptions](https://docs.abp.io/en/abp/latest/Timing#clock-options) start from 5.0, before `DateTime` values in MongoDB are [always saved as UTC](https://mongodb.github.io/mongo-csharp-driver/2.13/reference/bson/mapping/#datetime-serialization-options).