Documentation on setting up a `C++` project using the `fstlib` library

[MarcusKlik]

Currently, there is no clear documentation on how to setup a C++ project using the fstlib library.

A sample C++ project would be a good starting point for potential users. Some ideas:

• command line tool that can read meta-data of a fst file
• command line tool that can provide statistics on the contents of a fst file
• command line tool that can do some (parallel) calculations on a selected column from a fst file
• command line tool that can convert parguet files to fst files using the arrow library as the in-memory tabular representation. That would really showcase the flexibility of the fstlib library.

Also, it would be interesting to compare the read- and write- speed of a pure C++ consumer to that of the fst package.