README file improvement.

[krtEngineer]

Just a quick fix.

There is a message in the usage section of the README.md file.

This statement (point 4 in the above image) does not specify what file name variation is expected, when looking at the code it is clear that only file name is expected without a relative path and format.

My suggestion is to include an example that clarifies the way the file name is expected in command

[krtEngineer]

@gitdagray please review this quick change. PR created #67
Starting with this quick change. Looking ahead for more critical contributions.

[devlopersabbir]

@krtEngineer I think no need for this if this pull request #64 will marge.