feat(users): add user entities and repository

src/Users/Domain/ArmoryRole.cs

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+using Microsoft.AspNetCore.Identity;
+
+namespace Armory.Users.Domain
+{
+    public class ArmoryRole : IdentityRole
+    {
+    }
+}

src/Users/Domain/ArmoryUser.cs

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+using Microsoft.AspNetCore.Identity;
+
+namespace Armory.Users.Domain
+{
+    public sealed class ArmoryUser : IdentityUser
+    {
+        public ArmoryUser(string username, string email, string phone)
+        {
+            UserName = username;
+            Email = email;
+            PhoneNumber = phone;
+        }
+
+        private ArmoryUser()
+        {
+        }
+
+        public static ArmoryUser Create(string username, string email, string phone)
+        {
+            var user = new ArmoryUser(username, email, phone);
+
+            return user;
+        }
+    }
+}

src/Users/Domain/IArmoryUserRepository.cs

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+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Identity;
+
+namespace Armory.Users.Domain
+{
+    public interface IArmoryUserRepository
+    {
+        Task<IdentityResult> Save(ArmoryUser user, string password);
+    }
+}