Add Makefile, gitignore and (empty-ish) source files

Makefile

@@ -0,0 +1,47 @@
+DIR_SRC := src
+DIR_BLD := build
+DIR_BIN := $(DIR_BLD)/bin
+
+OBJS := $(DIR_BLD)/tests.o \
+	$(DIR_BLD)/constants.o \
+	$(DIR_BLD)/core.o \
+	$(DIR_BLD)/console.o \
+	$(DIR_BLD)/string.o \
+	$(DIR_BLD)/convert.o
+OBJS_LST := false
+SRCS := $(patsubst $(DIR_BLD)/%.o,$(SRC_DIR)/%.asm,$(OBJS))
+
+COMPILER := nasm
+COMPILER_FLAGS := -f elf64
+COMPILER_FLAGS_D := -f elf64 -g -F dwarf
+LINKER := ld
+LINKER_FLAGS := -no-pie -z noexecstack -Ox
+
+.PHONY: all clean debug
+
+all: $(DIR_BIN)/tests
+
+$(DIR_BIN)/tests: $(OBJS)
+	@mkdir -p $(DIR_BIN)
+	$(LINKER) $^ -o $@ $(LINKER_FLAGS)
+	ln -sf $@ tests
+$(DIR_BLD)/%.o: $(DIR_SRC)/%.asm
+	@mkdir -p $(DIR_BLD)
+	@LST=$(basename $@).lst; \
+	if [ "$(OBJS_LST)" = "true" ]; then \
+		$(COMPILER) $< $(COMPILER_FLAGS) -l $$LST -o $@; \
+		echo $(COMPILER) $< $(COMPILER_FLAGS) -l $$LST -o $@; \
+	else \
+		$(COMPILER) $< $(COMPILER_FLAGS) -o $@; \
+		echo $(COMPILER) $< $(COMPILER_FLAGS) -o $@; \
+	fi
+
+clean:
+	rm -rf $(DIR_BLD) tests
+
+debug: COMPILER_FLAGS = $(COMPILER_FLAGS_D)
+debug: OBJS_LST := true
+debug: clean $(OBJS)
+	@mkdir -p $(DIR_BIN)
+	$(LINKER) $(OBJS) -o $(DIR_BIN)/tests $(LINKER_FLAGS)
+	ln -sf $(DIR_BIN)/tests tests