Add alternatives overview

[xonixx]

• jq https://github.com/stedolan/jq
• jp https://github.com/jmespath
• https://github.com/jsonata-js/jsonata
• etc.

[xonixx]

https://blog.kellybrazil.com/2020/03/25/jello-the-jq-alternative-for-pythonistas/

[xonixx]

#23