Command line interface

[floatas]

Example short:
mergePdf.exe -f File1.pdf -f File2.pdf -o Output.pdf

Example long:
mergePdf.exe --file=File1.pdf --file=File2.pdf --output=Output.pdf

Running without arguments from command line show help message.

There are few libraries for command line arguments that could be used:
https://github.com/docopt/docopt.net
https://www.nuget.org/packages/CommandLineParser/
https://www.nuget.org/packages/PowerArgs/