Added findStudentById Method to Administration class

src/main/java/org/example/Administration.java

@@ -80,6 +80,18 @@ public class Administration {
         return null;
     }
 
+    public Student findStudentById(String StudentId)
+    {
+        for(Student student :students)
+        {
+            if(student.getId().equals(StudentId))
+            {
+                return student;
+            }
+        }
+
+        return null;
+    }
     /**
      *
      * @param adminID the id of the admin you want to be deleted from the system