Added Sitecore.Client.dll to .gitignore
Added Sitecore.Kernel.dll to .gitignore
Added Sitecore.Automation.MarketingAutomation.dll to .gitignore
Added Sitecore.Logging.dll to .gitignore
Added Sitecore.Update.dll to .gitignore
Added Sitecore.Zip.dll to .gitignore
Added DLL instructions to the Sitecore DLLs folder.
Added Sitecore.Analytics.dll to .gitignore