info.plist for mac app store

calling all mac app store developers, i've been following this tutorial: http://technology.blurst.com/unity-games-and-mac-app-store/ and i've made my info.plist ready, since i have no idea about it, it would be great to have someone who knows whats needed to give me the thumbs up or let me know what needs changing... thanks in advance, here's the script:

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
     <key>CFBundleDevelopmentRegion</key>
     <string>English</string>
     <key>CFBundleExecutable</key>
     <string>Zombo Defence</string>
     <key>CFBundleGetInfoString</key>
     <string>Zombo Defence version 1.0</string>
     <key>CFBundleIconFile</key>
     <string>UnityPlayer.icns</string>
     <key>CFBundleIdentifier</key>
     <string>oinkoinkflapflap.Zombo Defence</string>
     <key>CFBundleInfoDictionaryVersion</key>
     <string>6.0</string>
     <key>CFBundleName</key>
     <string>Zombo Defence</string>
     <key>CFBundlePackageType</key>
     <string>APPL</string>
     <key>CFBundleShortVersionString</key>
     <string>1.0</string>
     <key>CFBundleSignature</key>
     <string>????</string>
     <key>CFBundleVersion</key>
     <string>1.0</string>
     <key>NSMainNibFile</key>
     <string>MainMenu</string>
     <key>NSPrincipalClass</key>
     <string>PlayerApplication</string>
     <key>UnityBuildNumber</key>
     <string>63135</string>
     <key>LSApplicationCategoryType<key>
     <string>public.app-category.strategy-games<string>
     <key>NSHumanReadableCopyright<key>
     <string>Zombo Defence v1.0 (c) oinkoinkflapflap<string>
 </dict>
 </plist>

just unsure about a few things like

     <key>CFBundleSignature</key>
     <string>????</string>

the tutorial didn't mention this and it seems it shouldn't be ???? i don't know!

the version on the tutorial is very long with many scary numbers but mine is a first version so i put 1.0, will that be ok?

thanks again look forward to your help! :D