io-formatting

IO formatting and simple file IO

Start from the template file formatting.F90 and do the following steps:

1. Open a file for writing with name my-file.txt
2. Write out variables string_value, int_value and real_value using formatting that gives you a line like this: My values are 87 and 0.343. HINT: you can add text also into the format string, for example '(I," is not same as ",F)'
3. Close the file

Check that the output is correct.