Setup IDE offline

https://manual.cs50.net/ide/offline

hello world

Wrong command at https://javarush.ru/quests/lectures/questharvardcs50.level01.lecture12

Correct command to check results is: check50 cs50/2018/spring/hello hello.c

See: https://github.com/cs50/docs/blob/master/_pages/problems/hello/hello.adoc