Add Population Target and more deriveds

Stars Assistant/Model/Planet.cs

@@ -5,7 +5,7 @@ namespace StarsAssistant.Model;
 
 public class Planet
 {
-    #region Persistant propeties
+    #region Persistant propeties (from Stars)
 
     [Key]
     public required string Name { get; set; }
@@ -80,6 +80,13 @@ public class Planet
 
     #endregion
 
+    #region Planning Properties
+
+    public int PopulationTargetPercent { get; set; } = 100;
+
+    #endregion
+
+
     #region Relationships
 
     public Race? Owner { get; set; }