gitignore: Exclude CocoaPods directory from Git repo.
gitignore: Exclude CocoaPods directory from Git repo.

The ios/Pods directory (like the node_modules/ directory) should not
be under source control. Only the Podfile.lock (like the yarn.lock)
should.

(We're not currently using CocoaPods, so this has no effect at
present. It's just for convenience when switching back to master from
experimental branches.)

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile