Added Execution Indicator

src/main/java/net/fretux/knockedback/ExecutionProgressPacket.java

@@ -0,0 +1,29 @@
+package net.fretux.knockedback;
+
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraftforge.network.NetworkEvent;
+
+import java.util.function.Supplier;
+
+public class ExecutionProgressPacket {
+    private final int timeLeft;
+
+    public ExecutionProgressPacket(int timeLeft) {
+        this.timeLeft = timeLeft;
+    }
+
+    public static void encode(ExecutionProgressPacket msg, FriendlyByteBuf buf) {
+        buf.writeInt(msg.timeLeft);
+    }
+
+    public static ExecutionProgressPacket decode(FriendlyByteBuf buf) {
+        return new ExecutionProgressPacket(buf.readInt());
+    }
+
+    public static void handle(ExecutionProgressPacket msg, Supplier<NetworkEvent.Context> ctx) {
+        ctx.get().enqueueWork(() -> {
+            net.fretux.knockedback.client.ClientExecutionState.setTimeLeft(msg.timeLeft);
+        });
+        ctx.get().setPacketHandled(true);
+    }
+}