add ex16 reading and write file
add ex17 more files
add ex19 names variables code functions
add ex19 functions and variables
add ex20 functions and files
add ex21 functions can return something
add ex22 what do you know so far
ex23 read some code
add ex24 more practice
add ex25 even more practice
add ex27 take a test
add ex27 memorizing logic
add ex28 Boolean practice
add ex29 what if
add ex30 else and if
ruby page add ex16 to ex30 and delete file2013-09-11-The-Hard-Way-Summary.md
add ex31 making decisions
add ex32 loops and arrays
add ex33 while loops
add ex34 accessing elements of arrays