Add project files.

MyOffice.Migration.Postgres/Migrations/20230408172213_phone.cs

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+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace MyOffice.Migrations.Postgres.Migrations
+{
+    /// <inheritdoc />
+    public partial class phone : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "Phone",
+                table: "Users",
+                type: "text",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "Phone",
+                table: "Users");
+        }
+    }
+}