Added few instructions and Putty download link

Signed-off-by: Felipe Rodriguez <feliipe.rs@hotmail.com>
Signed-off-by: Lucas Di Landro <lu.ka11@hotmail.com>
Acked-by: Daniel Francis <francis@sugarlabs.org>
Merge pull request #1 from fellipe345/patch-1

Added few instructions and Putty download link