squash a bunch of commits

Shogi.Database/User/Tables/LoginPlatform.sql

@@ -0,0 +1,4 @@
+CREATE TABLE [user].[LoginPlatform]
+(
+	[Platform] NVARCHAR(20) NOT NULL PRIMARY KEY
+)

Shogi.Database/User/Tables/User.sql

@@ -0,0 +1,11 @@
+CREATE TABLE [user].[User]
+(
+	[Id] BIGINT NOT NULL PRIMARY KEY IDENTITY,
+	[Name] [user].[UserName] NOT NULL UNIQUE,
+	[DisplayName] NVARCHAR(100) NOT NULL,
+	[Platform] NVARCHAR(20) NOT NULL,
+
+	CONSTRAINT User_Platform FOREIGN KEY ([Platform]) References [user].[LoginPlatform] ([Platform])
+		ON DELETE CASCADE
+		ON UPDATE CASCADE
+)