Added database entities, started with node crud

MoonlightServers.ApiServer/Database/Entities/Node.cs

@@ -0,0 +1,16 @@
+namespace MoonlightServers.ApiServer.Database.Entities;
+
+public class Node
+{
+    public int Id { get; set; }
+
+    public string Name { get; set; }
+
+    public string Fqdn { get; set; }
+    public int ApiPort { get; set; }
+    public string Token { get; set; }
+    public bool SslEnabled { get; set; }
+
+    public List<Allocation> Allocations { get; set; } = new();
+    public List<Server> Servers { get; set; } = new();
+}