feat(kernel): add int 0x80 syscall dispatch table

include/syscall.h

@@ -0,0 +1,19 @@
+#ifndef FROSTBYTE_SYSCALL_H
+#define FROSTBYTE_SYSCALL_H
+
+#define sysExit     0
+#define sysWrite    1
+#define sysRead     2
+#define sysYield    3
+#define sysGetpid   4
+#define sysSbrk     5
+#define sysSleep    6
+#define sysOpen     7
+#define sysClose    8
+#define sysLseek    9
+#define sysStat     10
+#define sysGetdents 11
+#define sysMkdir    12
+#define sysUnlink   13
+
+#endif