Updated Frequently Asked Questions (markdown)
Added explanation for issue related to Java's Security Manager.
The extra pages are no longer fetched, this is handled in the PR https://github.com/Azure/azure-sdk-for-java/pull/6465
some clean up of ADB entry
Adding FAQ entry for running track2 based applications in Azure Data bricks
Adding FAQ - My app uses the async client libraries, but it never seems to get any results
Created Frequently Asked Questions (markdown)