Helpful information for those running in Docker on M1 Mac (#365)

* Guidance for users with M1 Macs

Multiple people have reported issues with running Chrome inside docker on M1 Macs preventing Ferrum from working. This results in a lot of wasted time because so few people have the same problem.

* Update README.md

README.md

@@ -134,6 +134,7 @@ In docker as root you must pass the no-sandbox browser option:
 Ferrum::Browser.new(browser_options: { 'no-sandbox': nil })
 ```
 
+It has also been reported that the Chrome process repeatedly crashes when running inside a Docker container on an M1 Mac preventing Ferrum from working. Ferrum should work as expected when deployed to a Docker container on a non-M1 Mac.
 
 ## Customization