Add bundle usage to the build process documentation

README.md

@@ -33,9 +33,10 @@ It's currently written in Objective-C / Swift and uses [VLCKit](https://code.vid
 
 ### VLC-iOS
 
-1. Run `pod install`.
-2. Open `VLC.xcworkspace`.
-3. Hit "Build and Run".
+1. Run `bundle install`.
+2. Run `bundle exec pod install`.
+3. Open `VLC.xcworkspace`.
+4. Hit "Build and Run".
 
 ### Custom VLCkit