Added EF and DB to the core, crude demo in the UI

WinWARP.Core/Services/Implementations/SubscriptionDbService.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Microsoft.EntityFrameworkCore;
+using WinWARP.Core.Data;
+using WinWARP.Core.Models.Entities;
+using WinWARP.Core.Services.Interfaces;
+
+namespace WinWARP.Core.Services.Implementations;
+
+public class SubscriptionDbService : ISubscriptionDbService
+{
+    private IDbContextFactory<AppDbContext> _dbContextFactory;
+
+    public SubscriptionDbService(IDbContextFactory<AppDbContext> dbContextFactory)
+    {
+        _dbContextFactory = dbContextFactory;
+    }
+
+    public async Task<List<Subscription>> GetSubscriptionsAsync()
+    {
+        using var dbContext = await _dbContextFactory.CreateDbContextAsync();
+        return await dbContext.Subscriptions.ToListAsync();
+    }
+
+    public async Task AddSubscriptionAsync(Subscription subscription)
+    {
+        using var dbContext = await _dbContextFactory.CreateDbContextAsync();
+        dbContext.Subscriptions.Add(subscription);
+        await dbContext.SaveChangesAsync();
+    }
+}