Add backpack, not finished

src/main/java/org/littletonrobotics/frc2024/subsystems/rollers/backpack/Backpack.java

@@ -0,0 +1,28 @@
+package org.littletonrobotics.frc2024.subsystems.rollers.backpack;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import org.littletonrobotics.frc2024.util.LoggedTunableNumber;
+import org.littletonrobotics.frc2024.util.drivers.rollers.GenericRollerSystem;
+
+import java.util.function.DoubleSupplier;
+
+@Setter
+@Getter
+public class Backpack extends GenericRollerSystem<Backpack.Goal> {
+    @RequiredArgsConstructor
+    @Getter
+    public enum Goal implements VoltageGoal {
+        IDLING(() -> 0),
+        AMP_SCORING(new LoggedTunableNumber("Backpack/AmpScoringVoltage"));
+
+        private final DoubleSupplier voltageSupplier;
+    }
+
+    private Goal goal = Goal.IDLING;
+
+    public Backpack(BackpackIO io) {
+        super("Backpack", io);
+    }
+}

src/main/java/org/littletonrobotics/frc2024/subsystems/rollers/backpack/BackpackIOSim.java

@@ -0,0 +1,14 @@
+package org.littletonrobotics.frc2024.subsystems.rollers.backpack;
+
+import edu.wpi.first.math.system.plant.DCMotor;
+import org.littletonrobotics.frc2024.util.drivers.rollers.GenericRollerSystemIOSim;
+
+public class BackpackIOSim extends GenericRollerSystemIOSim implements BackpackIO {
+    private static final DCMotor motorModel = DCMotor.getNeoVortex(1);
+    private static final double reduction = (1.0 / 1.0);
+    private static final double moi = 0.001;
+
+    public BackpackIOSim() {
+        super(motorModel, reduction, moi);
+    }
+}