build instructions in readme

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 # Semaphore-rs

 Rust support library for Semaphore
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+## Build static lib via ffi
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+Build e.g. for iOS simulator:
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+`cargo build --release --target=aarch64-apple-ios-sim`
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+Generate header file:
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+`cbindgen ./src/lib.rs -c cbindgen.toml | grep -v \#include | uniq > libsemaphore.h`