Replaced the test scripts with the examples from the README

Author: azixMcAze

Assets/AttributeTest1.cs

@@ -0,0 +1,11 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// Let's say that this script has an execution order of 50
+// set from the Script Execution Order inspector in Unity
+public class Script1 : MonoBehaviour {
+    void Start () {
+        Debug.Log("First");
+    }
+}

Assets/AttributeTest2.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// this script will have an execution order of 60 (50+10)
+[ExecuteAfter(typeof(Script1))]
+public class Script2 : MonoBehaviour {
+    void Start () {
+        Debug.Log("Second");
+    }
+}

Assets/AttributeTest3.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+// this script will have an execution order of 100
+[ExecutionOrder(100)]
+public class Script3 : MonoBehaviour {
+    void Start () {
+        Debug.Log("Third");
+    }
+}