add readme for ios setup (#234)

apps/ios/README.md

@@ -0,0 +1,43 @@
+# Setup for iOS
+
+## Prerequisites
+
+- `mac2ios` executable and in PATH:
+
+  https://github.com/zw3rk/mobile-core-tools
+
+- Folders:
+
+  ```sh
+  mkdir -p ./apps/ios/Libraries/mac ./apps/ios/Libraries/ios ./apps/ios/Libraries/sim
+  ```
+
+## Update binaries
+
+1. Download binary distribution from `aarch64-darwin:lib:simplex-chat.aarch64-darwin` job at
+https://ci.zw3rk.com/jobset/zw3rk/simplex-chat
+and extract binaries to `./apps/ios/Libraries/mac`.
+
+2. Prepare binaries for iOS and for Xcode simulator:
+
+    ```sh
+    chmod +w ./apps/ios/Libraries/mac/*
+    cp ./apps/ios/Libraries/mac/* ./apps/ios/Libraries/ios
+    cp ./apps/ios/Libraries/mac/* ./apps/ios/Libraries/sim
+    for f in ./apps/ios/Libraries/ios/*; do mac2ios $f; done | wc -l
+    for f in ./apps/ios/Libraries/sim/*; do mac2ios -s $f; done | wc -l
+    ```
+
+3. Put binaries into `./apps/ios/Libraries`.
+
+    For simulator:
+
+    ```sh
+    cp ./apps/ios/Libraries/sim/* ./apps/ios/Libraries
+    ```
+
+    For iOS:
+
+    ```sh
+    cp ./apps/ios/Libraries/ios/* ./apps/ios/Libraries
+    ```