Add Makefile for building go components

* Makefile with the following targets
	** build for (linux system)
     	** build_win  (windows system)
     	** build_tag (build from the last tag)
     	** clean  for (removing the binaries)
* Adjust README file

Makefile

@@ -0,0 +1,39 @@
+# Simple Make file to build csaf_distribution components
+
+SHELL=/bin/bash
+BUILD = go build
+buildMsg = "Building binaries..."
+
+.PHONY: build build_win build_tag clean
+
+all:
+	@echo choose a target from: build build_win build_tag clean
+
+# Build all the binaries and place them in the current directory level.
+build:
+	@echo $(buildMsg)
+	@$(BUILD) -o ./ -v ./cmd/...
+
+# Build the binaries for windows and place them in the current directory level.
+build_win:
+	@echo $(buildMsg)
+	@env GOOS=windows $(BUILD)  -o ./ -v ./cmd/...
+
+# Build the binaries from the latest github tag.
+TAG = $(shell git tag --sort=-version:refname | head -n 1)
+build_tag:
+ifeq ($(TAG),)
+	@echo "No Tag found"
+else
+	@git checkout -q tags/${TAG};
+	@echo $(buildMsg)
+	@$(BUILD) -o ./ -v ./cmd/...;
+	@env GOOS=windows $(BUILD)  -o ./ -v ./cmd/...
+	@git checkout -q main
+endif
+
+# Remove binary files
+clean:
+	@rm -f csaf_checker csaf_provider csaf_uploader csaf_checker.exe csaf_provider.exe csaf_uploader.exe
+
+