Implemented models

PostFundManagement.Infrastructure/Database/ApplicationDbContext.cs

@@ -0,0 +1,12 @@
+using PostFundManagement.Domain.Entities;
+
+namespace PostFundManagement.Infrastructure.Database;
+
+public sealed class ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : DbContext(options)
+{
+    public DbSet<Portfolio> Portfolios => Set<Portfolio>();
+
+    public DbSet<Instrument> Instruments => Set<Instrument>();
+    
+    public DbSet<User> Users => Set<User>();
+}