Doc: provide an usage example of combining fpdf2 with Plotly

[Lucas-C]

We already have a page about Charts & graphs in our documentation, and other ones about combining fpdf2 with other libs.

Plotly is a powerful and well-known charting library that can can produces SVG.
It would be interesting to provide a documentation section on how to generate a chart with Plotly and embed it in fpdf2.

Note that at least one fpdf2 user has been successful in doing so in the past: #526

[ranbir7]

hey there
How can I contribute to this??
Please give me a detailed guide since I'm very new to this.

[Lucas-C]

Hi and welcome @ranbir7 😊

The first step would be to read the Development guidelines.

Regarding this task, the goal will be to submit a Pull Request:

• https://opensource.guide/how-to-contribute/#how-to-submit-a-contribution
• https://opensource.com/article/19/7/create-pull-request-github

This PR will be an update of the Markdown file https://github.com/PyFPDF/fpdf2/blob/master/docs/Maths.md.
The idea is to add a new section that explains how insert charts/graphs generated with Plotly into a PDF document produced with fpdf2.

Of course, prior to this Pull Request, you will have to experiment yourself on how to do such thing 😄
This documentation page would be a good starting point: https://plotly.com/python/static-image-export/

Also: No such thing as a stupid question: feel free to ask anything there if things are unclear!