Add: README

Fix: newline when PrintInt outputs 0

code/userprog/ksyscall.h

@@ -37,7 +37,7 @@ int SysCreate(char *filename)
 }
 
 void SysPrintInt(int value) {
-  static char zero[2] = "0";
+  static char zero[3] = "0\n";
 
   if (value == 0) {
     kernel->synchConsoleOut->PutString(zero);