comments to startup file

BrightGlimmer.Data/Migrations/20190504201523_Update-Database.cs

@@ -0,0 +1,26 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace BrightGlimmer.Data.Migrations
+{
+    public partial class UpdateDatabase : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<decimal>(
+                name: "Grade",
+                table: "AssignedCourses",
+                nullable: true,
+                oldClrType: typeof(decimal));
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AlterColumn<decimal>(
+                name: "Grade",
+                table: "AssignedCourses",
+                nullable: false,
+                oldClrType: typeof(decimal),
+                oldNullable: true);
+        }
+    }
+}