Add 28 day code

28_day/walk/!cons_9x.bat

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+command

28_day/walk/!cons_nt.bat

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+cmd.exe

28_day/walk/Makefile

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+APP      = walk
+STACK    = 1k
+MALLOC   = 48k
+
+include ../app_make.txt

28_day/walk/make.bat

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+..\..\z_tools\make.exe %1 %2 %3 %4 %5 %6 %7 %8 %9

28_day/walk/walk.c

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+#include "apilib.h"
+
+void HariMain(void)
+{
+	char *buf;
+	int win, i, x, y;
+	api_initmalloc();
+	buf = api_malloc(160 * 100);
+	win = api_openwin(buf, 160, 100, -1, "walk");
+	api_boxfilwin(win, 4, 24, 155, 95, 0);/*黑色*/
+	x = 76;
+	y = 56;
+	api_putstrwin(win, x, y, 3, 1, "*");/*黄色*/
+	for (;;) {
+		i = api_getkey(1);
+		api_putstrwin(win, x, y, 0 , 1, "*"); /*用黑色擦除*/
+		if (i == '4' && x >   4) { x -= 8; }
+		if (i == '6' && x < 148) { x += 8; }
+		if (i == '8' && y >  24) { y -= 8; }
+		if (i == '2' && y <  80) { y += 8; }
+		if (i == 0x0a) { break; } /*按回车键结束*/
+		api_putstrwin(win, x, y, 3 , 1, "*");/*黄色*/
+	}	
+	api_closewin(win);
+	api_end();
+}