Add Performance docs for Cordova

[t-h-man]

Core or SDK?

Platform/SDK

Which part? Which one?

Cordova SDK

Description

According to the Changelog , v1.00 introduced Performance Monitoring

Suggested Solution

A Performance section needs to be added in the docs

[getsentry-release]

Routing to @getsentry/team-mobile for triage. ⏲️

[chadwhitacre]

Hrm ... need to look into why the label bot didn't remove "Untriaged" 🤔

[kahest]

@lucas-zimerman can you take a look please?

[bruno-garcia]

We originally left this out because we didn't want to maintain performance on Cordova. Same was for any new product. Since cordova is hard to maintain and is pretty much becoming irrelevant