chore: 首次簽入 Thinkyu ASP.NET 專案

- 加入 Visual Studio / ASP.NET .gitignore
- 排除建置輸出、IDE 設定、NuGet packages、大型 MSI 安裝檔

報到系統/Forms/Constructing.aspx

@@ -0,0 +1,13 @@
+<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Constructing.aspx.cs" Inherits="報到系統.Forms.Constructing" %>
+
+<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
+</asp:Content>
+
+<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
+    <div id="homeApp" class="page-container">
+        <h1 class="page-title">功能建置中...</h1>
+    </div>
+</asp:Content>
+
+<asp:Content ID="Content3" ContentPlaceHolderID="script" runat="server">
+</asp:Content>