docs: adding makefile and clarify license

Makefile

@@ -0,0 +1,15 @@
+SJASMPLUS = sjasmplus
+SJASMPLUSFLAGS = --nologo
+INCLUDE_FILES = $(wildcard src/*.asm)
+
+# try to assemble the "runtime" file as standalone file (as if included elsewhere)
+# then create the binary of the dot command
+HTTP: src/main.asm $(INCLUDE_FILES) Makefile
+	$(SJASMPLUS) --zxnext $(SJASMPLUSFLAGS) src/main.asm
+
+.PHONY: all clean
+
+all: HTTP
+
+clean:
+	$(RM) -f HTTP src/*.labels src/*.sld

README.md

@@ -156,8 +156,9 @@ Then include the `http-debug.bin` that was saved on  your Next to help debug the
 - Uses [sjasmplus](https://z00m128.github.io/sjasmplus/documentation.html) from VS Code task
 - Follows this [code convention](https://github.com/remy/z80-code-conventions)
 - Entry point is main.asm
+- Optional `Makefile` has been included
 
-## License
+## License for .HTTP
 
 It's in the license link, but all the same: