add script for xcode to build PlayerCore as a static lib

Scripts/build_player_core.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+
+set -e
+
+# Location of rust project
+RUST_PROJ="$PROJECT_DIR/PlayerCore"
+# Location of the "Anvil" folder in the iOS project
+IOS_ANVIL="$PROJECT_DIR"
+# Provide access to Rust utilities
+PATH="$PATH:/Users/kit/.cargo/bin"
+
+cd "$RUST_PROJ"
+
+# Generate C bindings
+cbindgen -l C -o target/libspottie_player_core.h
+
+configLowercase=$(echo "$CONFIGURATION" | tr '[:upper:]' '[:lower:]')
+
+echo "Building $configLowercase configuration for target(s) $ARCHS"
+
+targets=()
+for arch in $ARCHS; do
+  if [ $arch == "arm64" ]; then
+    arch="aarch64"
+  fi
+  targets+=($arch-apple-darwin)
+done
+
+libPaths=()
+for target in "${targets[@]}"; do
+  cargo build $(if [ $CONFIGURATION == "Release" ]; then echo "--release"; fi) --target $target
+
+  libPaths+=("target/$target/$configLowercase/libspottie_player_core.a")
+done
+
+# Create universal library
+lipo -create ${libPaths[@]} -output target/libspottie_player_core.a
+
+# Copy resources to the iOS folder, overwriting old ones
+cp target/libspottie_player_core.h target/libspottie_player_core.a "$IOS_ANVIL/Spottie/PlayerCore"