add command z

[rhea-s]

Advanced HW 5 submission

Closes #283

Name: Rhea Singh
Uniqname: rheas

added command 'z' to reference page

[samkhn]

Hey this is a good start.

Can you go in depth on some of the example output one could see if they were using z? Like in the example if I run z foo, what should I expect my machine to be able to do now?

Your useful option isn't clear: does cd foo bar mean that I'll be able it'll look for foo and if it can't find foo it'll cd bar? Does this mean it'll spawn two terminals one to cd into foo and another to cd into bar?

Could you also provide more useful options? (maybe explore the r, t, l flags?)

Thanks.