added new projects and some base code for persistence

Tv7Playlist.Data/PlaylistContext.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace Tv7Playlist.Data
+{
+    public class PlaylistContext : DbContext
+    {
+        public PlaylistContext(DbContextOptions<PlaylistContext> options)
+            : base(options)
+        {
+        }
+
+        public DbSet<PlaylistEntry> PlaylistEntries { get; set; }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            base.OnModelCreating(modelBuilder);
+
+            var entityTypeBuilder = modelBuilder.Entity<PlaylistEntry>();
+            entityTypeBuilder.HasKey(e => e.Id);
+            entityTypeBuilder.HasAlternateKey(e => e.TrackNumber);
+        }
+    }
+}

Tv7Playlist.Data/PlaylistEntry.cs

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+using System;
+
+namespace Tv7Playlist.Data
+{
+    public class PlaylistEntry
+    {
+        public Guid Id { get; set; }
+
+        public int TrackNumber { get; set; }
+
+        public string Name { get; set; }
+        
+        public string Url { get; set; }
+    }
+}

Tv7Playlist.Data/Tv7Playlist.Data.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>netstandard2.0</TargetFramework>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.2.0" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="2.2.0" />
+    </ItemGroup>
+
+</Project>