organize into upm directory structure

Samples~/ExampleAnimalWorldAssembly/AmimalWorld.asmdef

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+{
+	"name": "AmimalWorld"
+}

Samples~/ExampleAnimalWorldAssembly/AmimalWorld.asmdef.meta

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+guid: 6b7100eb7c609e2418517e5c25caaf2a
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
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Samples~/ExampleAnimalWorldAssembly/Animals.meta

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Samples~/ExampleAnimalWorldAssembly/Animals/AnimalBase.cs

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+using System;
+using UnityEngine;
+
+[Serializable]
+public class AnimalBase : IAnimal
+{
+    [SerializeField] protected float age;
+    public GameObject food;
+    public virtual void Feed()
+    {
+        Debug.Log("Thanks");
+    } 
+}
+  
+[Serializable]
+public class AnimalChild : AnimalBase {} 
+
+[Serializable]
+public abstract class AnimalGrandChildAbstract : AnimalBase
+{
+    public string someString;
+}
+
+[Serializable]
+public class AbstractAnimalGrandChild : AnimalGrandChildAbstract {}
+
+
+[Serializable]
+public abstract class AbstractAnimal : IAnimal
+{
+    [SerializeField] protected float age;
+    public GameObject food;
+    public virtual void Feed()
+    {
+        Debug.Log("Thanks");
+    } 
+}
+
+[Serializable]
+public class AbstractAnimalChild : AbstractAnimal {}
+
+

Samples~/ExampleAnimalWorldAssembly/Animals/AnimalBase.cs.meta

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Samples~/ExampleAnimalWorldAssembly/Animals/IAnimal.cs

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+public  interface IAnimal
+{
+    void Feed();
+}

Samples~/ExampleAnimalWorldAssembly/Animals/IAnimal.cs.meta

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Samples~/ExampleAnimalWorldAssembly/Animals/MammalBase.cs

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+using System;
+ 
+[Serializable]
+public abstract class MammalBase : AnimalBase
+{  
+    public int numberOfBones;
+}  

Samples~/ExampleAnimalWorldAssembly/Animals/MammalBase.cs.meta

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