Add example

Makefile

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+#******************************************************************************
+# Makefile<build>                                             'build' project 
+#******************************************************************************
+#
+#  File Description:
+#
+#    A sample maefile for 'build'
+#
+#
+#
+#
+#
+#
+#
+#
+#******************************************************************************
+# (C) 2017 Christophe de Dinechin <christophe@dinechin.org>
+#  This software is licensed under the GNU General Public License v3
+#  See file COPYING for details.
+#******************************************************************************
+
+# Define the path to 'build' (can be a git submodule in your project)
+BUILD=./
+
+# Define the source code
+SOURCES=hello.cpp
+
+# Define the product of the build (.exe will be removed for Unix builds)
+PRODUCTS=hello.exe
+
+# Define what to test
+TESTS=product count-characters
+
+# Define what to benchmark
+BENCHMARKS=product
+
+# Include the makefile rules
+include $(BUILD)rules.mk
+
+count-characters.runtest:
+	@echo Output has `$(OBJPRODUCTS) | wc -c` characters, should be 35

hello.cpp

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+#include <iostream>
+
+int main()
+{
+    std::cout << "You successfully built using build\n";
+}