Add example project, devcontainer config and debugger config

Makefile

@@ -0,0 +1,10 @@
+myprog.sna myprog.tap myprog.sld: main.asm loader.asm print.asm
+	sjasmplus --sld=myprog.sld --fullpath main.asm
+
+clean:
+	rm -f *.tap
+	rm -f *.sna
+	rm -f *.sld
+	rm -rf .tmp/
+
+.PHONY: clean