[Ch6Nb04] Added commands to download and unzip 'glove.6B.zip'

1.	Added a try except block for uploading files in colab and windows.
2.	Added a path to download 'glove.6B.zip' for both colab and windows using wget.
3.	Added unzip command for both colab and windows to unzip 'glove.6B.zip'.

Author: KUMAR-APURVA