Added findAdminbyId Method to Administration class

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

@@ -67,6 +67,19 @@ public class Administration {
         return null;
     }
 
+    public Admin findAdminById(String adminId)
+    {
+        for(Admin admin :admins)
+        {
+            if(admin.getId().equals(adminId))
+            {
+                return admin;
+            }
+        }
+
+        return null;
+    }
+
     /**
      *
      * @param adminID the id of the admin you want to be deleted from the system