Added database entities, started with node crud

MoonlightServers.ApiServer/Database/Entities/StarFolder.cs

@@ -0,0 +1,10 @@
+namespace MoonlightServers.ApiServer.Database.Entities;
+
+public class StarFolder
+{
+    public int Id { get; set; }
+
+    public string Name { get; set; }
+
+    public List<Star> Stars { get; set; } = new();
+}