Added Sql project with database schema. Added SqlServer repositories for Site, Folder, and User (Cipher still TODO). Switched DI in Startup to SqlServer repos.

src/Sql/dbo/Stored Procedures/User_Update.sql

@@ -0,0 +1,29 @@
+CREATE PROCEDURE [dbo].[User_Update]
+    @Id UNIQUEIDENTIFIER,
+    @Name NVARCHAR(50),
+    @Email NVARCHAR(50),
+    @MasterPassword NVARCHAR(300),
+    @MasterPasswordHint NVARCHAR(50),
+    @Culture NVARCHAR(10),
+    @SecurityStamp NVARCHAR(50),
+    @TwoFactorEnabled BIT,
+    @TwoFactorProvider TINYINT,
+    @AuthenticatorKey NVARCHAR(50),
+    @CreationDate DATETIME2(7)
+AS
+BEGIN
+    UPDATE [dbo].[User]
+    SET
+        [Name] = @Name,
+        [Email] = @Email,
+        [MasterPassword] = @MasterPassword,
+        [MasterPasswordHint] = @MasterPasswordHint,
+        [Culture] = @Culture,
+        [SecurityStamp] = @SecurityStamp,
+        [TwoFactorEnabled] = @TwoFactorEnabled,
+        [TwoFactorProvider] = TwoFactorProvider,
+        [AuthenticatorKey] = @AuthenticatorKey,
+        [CreationDate] = @CreationDate
+    WHERE
+        [Id] = @Id
+END