Add Makefile that's a blatant ripoff of RPNG.

nbio/Makefile

@@ -0,0 +1,20 @@
+TARGET := nbio_test
+
+SOURCES := $(wildcard *.c)
+OBJS := $(SOURCES:.c=.o)
+
+CFLAGS += -Wall -pedantic -std=gnu99 -O0 -g -I../../include
+
+all: $(TARGET)
+
+%.o: %.c
+	$(CC) -c -o $@ $< $(CFLAGS)
+
+$(TARGET): $(OBJS)
+	$(CC) -o $@ $^ $(LDFLAGS)
+
+clean:
+	rm -f $(TARGET) $(OBJS)
+
+.PHONY: clean
+