start elevator subsystem

src/main/java/frc/robot/subsystems/ElevatorSubsystem.java

@@ -0,0 +1,23 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package frc.robot.subsystems;
+
+import edu.wpi.first.math.controller.PIDController;
+import edu.wpi.first.wpilibj2.command.SubsystemBase;
+import frc.robot.Constants;
+
+import com.revrobotics.CANSparkMax;
+import com.revrobotics.RelativeEncoder;
+import com.revrobotics.CANSparkLowLevel.MotorType;
+
+public class ElevatorSubsystem extends SubsystemBase {
+  /** Creates a new ElevatorSubsystem. */
+  public ElevatorSubsystem() {}
+
+  @Override
+  public void periodic() {
+    // This method will be called once per scheduler run
+  }
+}