Add complete "Makefile" for standard packaging

Also include a ".gitignore" with the derived assets.

---

On the "Makefile", the canonical virtual targets implemented are:

- "all": the default target name when no explicit name is given, or when
  one wants to build more than one target at once, such as:
  `make all check`.  All it builds is the "libtweetnacl.a" library;
- "check": NOOP, as there are no tests implemented;
- "clean": removes the "tweetnacl.o" and "libtweetnacl.a" files, which
  represent 100% of the generated assets;
- "install": uses `$(DESTDIR)`, `$(LIBDIR)`, `$(INCLUDEDIR)` and
  `$(SRCDIR)` to properly place the "libtweetnacl.a" library, the
  "tweetnacl.h" header and the "tweetnacl.c" source in the correct
  place.  `$(LIBDIR)`, `$(INCLUDEDIR)` and `$(SRCDIR)` are defined based
  on `$(PREFIX)`;
- "uninstall": a perfect mirror of "install", which removes 100% of the
  installed artifacts.

1 files changed, 35 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..6b66dcd
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+.POSIX:
+PREFIX     = /usr
+NAME       = tweetnacl
+LIBDIR     = $(PREFIX)/lib
+INCLUDEDIR = $(PREFIX)/include
+SRCDIR     = $(PREFIX)/src/$(NAME)
+
+
+all: lib$(NAME).a
+
+lib$(NAME).a: lib$(NAME).a($(NAME).o)
+
+$(NAME).o: $(NAME).h
+
+
+check:
+
+clean:
+	rm -f *.o *.a
+
+
+install: all
+	mkdir -p \
+		'$(DESTDIR)$(LIBDIR)'     \
+		'$(DESTDIR)$(INCLUDEDIR)' \
+		'$(DESTDIR)$(SRCDIR)'
+	cp lib$(NAME).a        '$(DESTDIR)$(LIBDIR)'
+	cp $(NAME).h           '$(DESTDIR)$(INCLUDEDIR)'
+	cp $(NAME).h $(NAME).c '$(DESTDIR)$(SRCDIR)'
+
+uninstall:
+	rm -rf \
+		'$(DESTDIR)$(LIBDIR)'/lib$(NAME).a  \
+		'$(DESTDIR)$(INCLUDEDIR)'/$(NAME).h \
+		'$(DESTDIR)$(SRCDIR)'