title: gitignore not ignoring opencv2.framework
body: <p>I am trying to make git ignore the opencv2.framework I have imported into my project. However, even though I am adding opencv2.framework into my .gitignore, every time I run git status on my terminal, all the opencv2.framework files are showing up as new files. Could anybody help? Thanks! This is what my .gitignore file looks like: (I wrote opencv2.framework under ##Various Settings)</p>
  
  <pre><code># Xcode
  #
  # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore &amp; Swift.gitignore
  
  ## Build generated
  build/
  DerivedData/
  
  ## Various settings
  *.pbxuser
  !default.pbxuser
  *.mode1v3
  !default.mode1v3
  *.mode2v3
  !default.mode2v3
  *.perspectivev3
  !default.perspectivev3
  xcuserdata/
  opencv2.framework/
  
  ## Other
  *.moved-aside
  *.xccheckout
  *.xcscmblueprint
  
  ## Obj-C/Swift specific
  *.hmap
  *.ipa
  *.dSYM.zip
  *.dSYM
  
  ## Playgrounds
  timeline.xctimeline
  playground.xcworkspace
  
  # Swift Package Manager
  #
  # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
  # Packages/
  # Package.pins
  .build/
  
  # CocoaPods
  #
  # We recommend against adding the Pods directory to your .gitignore. However
  # you should judge for yourself, the pros and cons are mentioned at:
  # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
  #
  # Pods/
  
  # Carthage
  #
  # Add this line if you want to avoid checking in source code from Carthage dependencies.
  # Carthage/Checkouts
  
  Carthage/Build
  
  # fastlane
  #
  # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
  # screenshots whenever they are needed.
  # For more information about the recommended setup visit:
  # https://docs.fastlane.tools/best-practices/source-control/#source-control
  
  fastlane/report.xml
  fastlane/Preview.html
  fastlane/screenshots
  fastlane/test_output
  </code></pre>