Add Makefile with sync designation

Makefile

@@ -0,0 +1,31 @@
+# Define the source directory for assets
+SRC_DIR := lib
+
+# Define the destination directories for different languages
+PYTHON_DEST := python/countdown/assets
+R_DEST := r/inst/countdown
+QUARTO_DEST := quarto/_extensions/countdown/assets
+
+# Set the default target to sync
+.DEFAULT_GOAL := sync
+
+# Define the sync target
+sync: sync-python sync-r sync-quarto
+
+# Rule to copy assets to Python directory
+sync-python:
+	@echo "Syncing assets to Python directory..."
+	mkdir -p $(PYTHON_DEST)
+	cp -r $(SRC_DIR)/* $(PYTHON_DEST)
+
+# Rule to copy assets to R directory
+sync-r:
+	@echo "Syncing assets to R directory..."
+	mkdir -p $(R_DEST)
+	cp -r $(SRC_DIR)/* $(R_DEST)
+
+# Rule to copy assets to Quarto directory
+sync-quarto:
+	@echo "Syncing assets to Quarto directory..."
+	mkdir -p $(QUARTO_DEST)
+	cp -r $(SRC_DIR)/* $(QUARTO_DEST)