Update readme.txt

lab2/readme.txt

-Everyone has tried all questions and one of the answers was submitted.
-
-citations:
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-http://www.theunixschool.com/2012/06/insert-line-before-or-after-pattern.html
-https://stackoverflow.com/questions/30099736/sed-insert-line-after-x-lines-after-match
-https://stackoverflow.com/questions/15758814/turning-multiple-lines-into-one-line-with-comma-separated-perl-sed-awk
-https://unix.stackexchange.com/questions/19014/how-to-strip-multiple-spaces-to-one-using-sed
-http://www.linuxquestions.org/questions/programming-9/sed-how-do-you-replace-end-of-line-with-a-space-637013/
-https://stackoverflow.com/questions/29829755/sorting-array-in-shell-using-awk
+random file