Updated Swift example

examples/bindings/swift/libztExampleApp/README.md

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+## Example usage of libzt in Swift app via native static library
+***
+
+If any of the below instructions seem unclear see [HOWTO: Use a C++ Library from Swift](http://www.swiftprogrammer.info/swift_call_cpp.html) or drop us a message.
+
+ - Build (`make static_lib`) or Download: [libzt.a]()
+ - Add `libztWrapper.cpp` and `libztWrapper.hpp` and `libztWrapper.swift` to your project
+ - Add `include/` (from the cloned libzt repo) to your projects `Header Search Path`
+ - Build