Add compress and uncompress Makefile targets

- Threading is supported, so "make compress -j4" works fine.

Makefile

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4a3ddd6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,42 @@
+FILE_SIZE_LIMIT_MB = 25
+LARGE_FILES := $(shell find . -type f -size +$(FILE_SIZE_LIMIT_MB)M -not -path "./.git/*")
+
+LARGE_FILES_GZ := $(addsuffix .gz, $(LARGE_FILES))
+
+ARCHIVES := $(shell find . -type f -name "*.gz")
+ARCHIVE_SOURCES := $(basename $(ARCHIVES))
+
+.PHONY: clean
+clean:
+	echo "clean"
+
+
+
+.PHONY: verify
+verify:
+	echo "verify"
+
+
+
+$(LARGE_FILES_GZ): %.gz: %
+	@if [ $(suffix $<) == ".gz" ]; then\
+		echo "Warning: $< is already compressed. Skipping...";\
+	else\
+		gzip $< > /dev/null &&\
+		echo "$< -> $@";\
+	fi
+
+# This target compresses all files larger than 25 MB
+.PHONY: compress
+compress: $(LARGE_FILES_GZ)
+	@echo "Files larger than $(FILE_SIZE_LIMIT_MB) MBytes are compressed!"
+
+
+
+$(ARCHIVE_SOURCES): %: %.gz
+	@gzip -d $< &&\
+	echo "$< -> $@"
+
+.PHONY: uncompress
+uncompress: $(ARCHIVE_SOURCES)
+	@echo "All files are uncompressed!"