[DOC] Create pie charts documentation

[vagimeli]

What do you want to do?

• Request a change to existing documentation
• [ X] Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request and all versions that are affected.
Create new doc page and content for pie chart viz type

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
#1402
#2216

[vagimeli]

@vagimeli and @carolxob met with @joshuarrrr to update on dev status and documentation objectives; @carolxob to lead writing this topic