feat(core): add base entity and password hashing abstractions

src/FiscalOS.Core/Data/Entity.cs

@@ -0,0 +1,18 @@
+namespace FiscalOS.Core.Data;
+
+public abstract class Entity
+{
+  public Guid Id { get; init; }
+  public DateTimeOffset CreatedAt { get; private set; }
+  public DateTimeOffset UpdatedAt { get; private set; }
+
+  public void SetCreatedAt(DateTimeOffset createdAt)
+  {
+    CreatedAt = createdAt;
+  }
+
+  public void SetUpdatedAt(DateTimeOffset updatedAt)
+  {
+    UpdatedAt = updatedAt;
+  }
+}

src/FiscalOS.Core/Identity/IPasswordHasher.cs

@@ -0,0 +1,7 @@
+namespace FiscalOS.Core.Identity;
+
+public interface IPasswordHasher
+{
+  string Hash(string password);
+  bool Verify(string providedPassword, string hashedPassword);
+}

src/FiscalOS.Core/Usings.cs

@@ -0,0 +1 @@
+global using FiscalOS.Core.Data;