24 Bit CRC generation and validation for transport block

In Main.m, workflow is written to check the generation and validation for 24 bit CRC polynomials.

As per 3GPP TS 36.212 V8.8.0 (2009-12), two polynomials exists for 24 bit CRC.
gCRC24A(D) = [D^24 + D^23 + D^18 + D^17 + D^14 + D^11 + D^10 + D^7 + D^6 + D^5 + D^4 + D^3 + D + 1]
gCRC24B(D) = [D^24 + D^23 + D^6 + D^5 + D + 1]

We have tried to generate the CRC checksum for both polynomials. It can work for transport block of any length. Also, validation is done by generating burst errors of different message bits.

Main.m file gives a call to crc_append.m and crc_validate.m to generate and validate respectively.