Hacktoberfest: Add resources

[Gauravsharma-20]

Resources related to:

• Previous year papers for subjects
• Language - how you learned a particular language and the resources you used
• Different Tech resources for appropriate folders
• New Issues are also welcome

[Jyoti-prakash-rout]

plese assign me, i have lots of awesome resources.....!

[Gauravsharma-20]

You can create the PR and we'll mark that as hacktoberfest-accepted and that'll also work

[Bhavya1912]

@Gauravsharma-20 I added some free blockchain resources that might help

[Gauravsharma-20]

Thanks for contributing.