Adding documentation

Adding a PDF file on the fifth edition (1991) of the standard
ECMA-48 titled "Control Functions for Coded Character Sets".
Adding simple recoding script

Adding a simple script that calls 'script' and writes
both the timing data and the typescript data into a
temporary file, either appended by a user-speficied suffix
or a time stamp.
Adding a new .gitignore

This .gitignore file ignores both the compiled program and
it single object file.