feat: add database connections, initial migration and early CLI tooling

Entities/Playlist.cs

@@ -0,0 +1,25 @@
+namespace Shadow.Entities;
+public class Playlist
+{
+	required public int Id { get; set; }
+	required public string Name { get; set; }
+	required public string Uri { get; set; }
+	required public string Description { get; set; }
+	required public int CreatorId { get; set; } // UserId?
+
+	required public User Creator { get; set; }
+	public List<PlaylistUser> AuthorizedPlaylistUsers { get; set; } = [];
+
+	public bool CanAccess(User u) {
+		bool isUserPresent = false;
+		foreach (PlaylistUser pu in AuthorizedPlaylistUsers)
+		{
+			if (pu.User == u)
+			{
+				isUserPresent = true;
+				break;
+			}
+		}
+		return isUserPresent;
+	}
+}