(General)+makefile for common recipes that I'll use in this project

Just write a few lines and it saves so much time.  Don't try to
automate it too much though.

Makefile

@@ -0,0 +1,9 @@
+CC=clang++
+CFLAGS=-pedantic -Wall
+
+list: list.cpp
+	$(CC) $(CFLAGS) $^ -o $@
+
+.PHONY: memcheck_list
+memcheck_list: list
+	valgrind --leak-check=full ./list;