Added infrastructure and first database design

Nexus.Infrastructure/Persistence/NexusDbContext.cs

@@ -0,0 +1,21 @@
+using Microsoft.EntityFrameworkCore;
+using Nexus.Domain.Entities;
+
+namespace Nexus.Infrastructure.Persistence;
+public class NexusDbContext : DbContext
+{
+    public NexusDbContext(DbContextOptions<NexusDbContext> options)
+        : base(options)
+    {
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.ApplyConfigurationsFromAssembly(typeof(NexusDbContext).Assembly);
+        base.OnModelCreating(modelBuilder);
+    }
+
+    public DbSet<Project> Projects => Set<Project>();
+}
+
+