Added new files in test/ros_files/ for testing of directory read.
Changes Makefile target with automatic init:stop()
Added read directory test and imeplementation.
Added negative test for nonexistent files for ros_reader
Added makefile with test target for ros_reader
Added the first test and code for ros_reader
Updated .gitignore to ignore beam files
Changed the text in the exercise so there are now only 4 available ROS
files for problem One
Added two new ROS files
Added the two first ROS files for exercise one
Added the git ignore file with *~
Added the problem description file for problem one