Small copy changes (#54)
Small copy changes (#54)

* Small copy changes

* Update README.md

Some questions to the content:
- chal.conf - needs to be configured only if all three of the mentioned criteria are fulfilled? or should it be "or"?
- is the description I added for "Makefile" in the "/healthcheck" section correct?
- API contract - is the reference to the three directories in the intro sentence ok?
- Generally, the API contract section contains infos that refer to the directories, would it make sense to move that information to those sections directly? That would leave just "Your challenge receives connections on port 1337." for this section. 
- Should we nest the "Healthcheck" section below the section on the "/healthcheck" directory?

* Update README.md

Addressed all points discussed in the comments, let me know if anything is missing. Note that I changed the intro sentence for "API contract" slightly to make it fit to the new first bullet regarding "kctf_setup".

* Update README.md

implemented feedback from comments

* Update README.md

Corrected casing to nsjail

Co-authored-by: goedi02 <569992058c3b90efb3bc2794884acb89db4cab3e@users.noreply.github.com>
google/kctf,google/kctf,google/kctf