Add Kerbal Isp Difficulty Scaler

Add KIDS to ckan and updates FAR to suggest KIDS.

Obviously, I am not @ferram4 and I did not get permission from him for this pull request. Please let me know if you want me to contact him before going ahead with this pull request.

Also, I included the tag ```"x_netkan_license_ok": false``` because I don't have the author's go-ahead to add this mod to CKAN. Is this its right use?