Add Usages/Examples on how to use the tool to Readme.md

[sdthaker]

Could you please add usage/examples on how to use the tool. I didn't know we needed to use the flags first and then pass the input directory or the input file on cmd line until I reached out to you on how to use it. Cheers! :)

Here's how I did it:
https://github.com/sdthaker/Node-TILify#usages--examples

[omalk98]

Fixed with commit #c065866