Add cgreen unit test library and makefile

cgreen/Makefile

@@ -0,0 +1,38 @@
+# This Makefile ensures that the build is made out of source in a subdirectory called 'build'
+# If it doesn't exist, it is created and a Makefile created there (from Makefile.build)
+#
+# This Makefile also contains delegation of the most common make commands
+#
+# If you have cmake installed you should be able to do:
+#
+#	make
+#	make test
+#	make install
+#	make package
+#
+# That should build cgreen for C and C++, run some tests, install it locally and
+# generate two distributable packages.
+
+all: build
+	cd $(CGREEN_BUILD_DIR); make all
+
+test: build
+	cd $(CGREEN_BUILD_DIR); make test
+
+clean: build
+	cd $(CGREEN_BUILD_DIR); make clean
+
+package: build
+	cd $(CGREEN_BUILD_DIR); make package
+
+install:
+	cd $(CGREEN_BUILD_DIR); make install
+
+############# Internal
+
+build:
+	mkdir -p $(CGREEN_BUILD_DIR)
+	cp Makefile.build $(CGREEN_BUILD_DIR)/Makefile
+
+
+.SILENT: