Added documentation

README.md

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+# sys_prog
+
+System Programming exercises / homeworks.
+
+## Description
+
+[Rickroll](https://www.youtube.com/watch?v=9KxTcDsy9Gs)

sortlines/README.md

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+# sortlines
+
+Write a program called sortlines that reads one line at a time from the
+standard input, and outputs the sequence of words in each line sorted in
+lexicographical order. A word is a (maximal) contiguous sequence of alphabetic
+characters as defined by the isalpha library function. The output sequence for
+each line should be printed on a single line with each word separated by one
+space. An input line is guaranteed to be at most 1000 characters.