Initial Standard C Lib
Change LICENSE from MIT to Apache v2.0
Add test notes into README
[libc] Add test cases for <locale.h>
[libc] Add test cases for isalpha() in <ctype.h> and Makefiles
[libc] Add isdigit() in <ctype.h>
[libc] Add isalnum() in <ctype.h>
[libc] Add isxdigit() in <ctype.h>
[libc] Add isspace() in <ctype.h>
[libc:ctype] Add isupper() and islower()
[libc:ctype] Add tolower() and toupper()
[libc:ctype] Add iscntrl()
[libc:ctype] Add isgraph()
[libc:ctype] Add isprint()
[libc:ctype] Add ispunct()

- <ctype.h> DONE
[libc:string] Add strlen()

- Initial <string.h>
[libc:string] Add strncat()
[libc:string] Add strcmp() and strncmp()
[libc:string] Add memcmp()
[libc:string] Add strncpy()