Create Relativity.java (#7323)

* Create Relativity.java

Created the file that implements relativity formulae.

* Create RelativityTest.java

Test file created for Relativity.java.

* Update RelativityTest.java

Function name ambiguity resolved

* Update RelativityTest.java

DELTA increased

* Update Relativity.java

Extra white space removed

* Update Relativity.java

Extra spaces added

* Update RelativityTest.java

Spaces added and removed

* Update Relativity.java

White spaces added and removed

* Update RelativityTest.java

Added and removed spaces

* Update Relativity.java

* Update Relativity.java

Space removed

* Update Relativity.java

Replaced tabs by spaces

* Update RelativityTest.java

Tabs replaced by spaces