Add a workflow for setting up fpm and running the examples

[Ivan Pribec]

setup-fpm GitHub action:

• https://github.com/marketplace/actions/setup-fpm

Examples of use:

• https://github.com/LKedward/fhash/blob/master/.github/workflows/test.yml
• https://github.com/ivan-pi/fortran-flann/blob/master/.github/workflows/test.yml