add gpx-converter

[nidhaloff]

What is this Python project?

python package for manipulating gpx files and easily converting gpx to other different formats

Describe features.

• Convert gpx files to other formats such as csv, arrays, dataframes, excel and json
• Convert csv files to gpx
• Apply interpolation on the gpx data

What's the difference between this Python project and similar ones?

• convert gpx easily to most used formats and not only csv
• apply interpolation on the gpx data

Enumerate comparisons.

--

Anyone who agrees with this pull request could submit an Approve review to it.