Security doc update

Author: rxtur

Blogifier.sln

@@ -31,6 +31,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "docs", "docs", "{6015AFDB-9
 		docs\Disqus.md = docs\Disqus.md
 		docs\Import.md = docs\Import.md
 		docs\Notifications.md = docs\Notifications.md
+		docs\Security.md = docs\Security.md
 		docs\SqlServer.md = docs\SqlServer.md
 		docs\VideoAudio.md = docs\VideoAudio.md
 	EndProjectSection
@@ -41,7 +42,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{BE5E262F
 		build\build.ps1 = build\build.ps1
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Upgrade", "src\Upgrade\Upgrade.csproj", "{CECA836F-2FFA-47DA-B846-8F44C2A4B783}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Upgrade", "src\Upgrade\Upgrade.csproj", "{CECA836F-2FFA-47DA-B846-8F44C2A4B783}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

docs/Security.md

@@ -0,0 +1,23 @@
+Blogifier uses default ASP.NET Core Identity. User data saved in the database in the `AspNet...` 
+tables and managed by calling standard UserManager and SignInManager.
+
+### User Roles.
+There are no real roles, but Blogifier differentiates between admin and regular users. Admin can 
+manage application functionality, including create/delete users. Standard users can only write 
+and publish posts and upload and manage files.
+
+### Identity options
+Identity options defined in the `Startup.cs` and can be modified if do not fit requirements.
+By default, they pretty relaxed: you can use any characters in the user name and only password 
+restriction is to be at least six characters long.
+
+```csharp
+services.AddIdentity<AppUser, IdentityRole>(options => {
+    options.Password.RequireDigit = false;
+    options.Password.RequiredLength = 6;
+    options.Password.RequireNonAlphanumeric = false;
+    options.Password.RequireUppercase = false;
+    options.Password.RequireLowercase = false;
+    options.User.AllowedUserNameCharacters = null;
+})
+```

src/Core/Core.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netcoreapp2.1</TargetFramework>
-    <Version>2.0.2.0</Version>
+    <Version>2.0.2.1</Version>
   </PropertyGroup>
 
   <ItemGroup>