Add instructions to readme for fixing a clientsettings rendering issue.

[connect192168]

Added a FAQ section to the readme. Added an FAQ item to provided an explanation and instructions to fix a "Cookies and other site data" settings issue that causes the whole netify devtools panel to fail to render. When the "Cookies and other site data" global setting is set to "Block third-party cookies", it prevents netify from accessing "IndexedDB" The instructions given show the user how to add netify's extension ID as an exception to the "Block third-party cookies" (and site data) rule. I tried adding "chrome-extension://mdafhjaillpdogjdigdkmnoddeoegblj" as the site URL, but it wouldn't allow the "chrome-extension://" URL prefix.

https://imgur.com/S9sfvnF shows the errors that netify gives off when it can't read or write cookies or other site data. I got the image by opening a devtools window on the netify panel that failed to load using inspect, then going to the console of that devtools window to view errors given off by netify itself.

[connect192168]

This was a huge issue I had, that I fixed on my own (after a lot of tinkering). I figure it's best to address such a large issue in an FAQ section instead of handling it each time someone opens an issue on it.

[alexhua]

you can just add "mdafhjaillpdogjdigdkmnoddeoegblj" without "chrome-extension://" URL prefix to the rule list.