modify the MAX_ARCHIVE_SIZE for twrpTar binary
1.5GB -> 500MB
Update twrpTarMain/README.md add more detail for twrpTar binary

Signed-off-by: sndnvaps <sndnvaps@gmail.com>
fix build error && update README.md

Signed-off-by: sndnvaps <sndnvaps@gmail.com>