Add documentation and usage example for ignore_time_component

[amishas157]

resolves #

Problem

README does not have example for using ignore_time_component parameter in recency test. The only way to discover it is code search.

Solution

This PR adds explanation and usage example of ignore_time_component to README.

Checklist

• This code is associated with an issue which has been triaged and accepted for development.
• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the README.md (if applicable)