Ios build example

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diff --git a/example/ios/README.md b/example/ios/README.md
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+# Build for iOS
+
+Bellow are instructions for building TdLib for iOS, watchOS and also macOS.
+If you need just macOS build take a look [here](https://github.com/tdlib/td#os-x)
+
+## Build OpenSSL
+First, you should build OpenSSL library for ios
+```
+./build-openssl.sh
+```
+In this example we are using scripts from [Python Apple support](https://github.com/pybee/Python-Apple-support), but any other OpenSSL builds should work too.
+Libraries will be stored in `third_party/openssl/<platfrom>`. The next script will rely on this location.
+
+## Build TdLib
+Run:
+```
+./build.sh
+```
+This may take a while, because TdLib will be build about 8 times.
+As an upside resulting library for iOS will work on any architecture (arv7, armv7s, arm64) and even on a simulator.
+We use  [CMake/iOS.cmake](https://github.com/tdlib/td/blob/master/CMake/iOS.cmake) toolchain, other toolchains
+may work too. 
+
+Libraries will be store in `tdjson` directory.
+
+
diff --git a/example/ios/build-openssl.sh b/example/ios/build-openssl.sh
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+#!/bin/sh
+git clone https://github.com/pybee/Python-Apple-support
+cd Python-Apple-support
+git checkout 2.7
+cd ..
+#TODO: change openssl version
+platforms="macOS iOS watchOS tvOS"
+#platforms="macOS"
+for platform in $platforms;
+do
+echo $platform
+cd Python-Apple-support
+#NB: -j will fail
+make OpenSSL-$platform
+cd ..
+rm -rf third_party/openssl/$platform
+mkdir -p third_party/openssl/$platform/lib
+cp ./Python-Apple-support/build/$platform/libcrypto.a third_party/openssl/$platform/lib/
+cp ./Python-Apple-support/build/$platform/libssl.a third_party/openssl/$platform/lib/
+cp -r ./Python-Apple-support/build/$platform/Support/OpenSSL/Headers/ third_party/openssl/$platform/include
+done
diff --git a/example/ios/build.sh b/example/ios/build.sh
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+++ b/example/ios/build.sh
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+#/bin/sh
+td_path=$(realpath ../..)
+
+rm -rf build
+mkdir -p build
+cd build
+
+platforms="watchOS iOS macOS"
+for platform in $platforms;
+do
+  echo "Platform = ${platform} Simulator = ${simulator}"
+  openssl_path=$(realpath ../third_party/openssl/${platform})
+  echo $openssl_path
+  options="$options -DOPENSSL_FOUND=1"
+  options="$options -DOPENSSL_CRYPTO_LIBRARY=${openssl_path}/lib/libcrypto.a"
+  #options="$options -DOPENSSL_SSL_LIBRARY=${openssl_path}/lib/libssl.a"
+  options="$options -DOPENSSL_INCLUDE_DIR=${openssl_path}/include"
+  options="$options -DOPENSSL_LIBRARIES=${openssl_path}/lib/libcrypto.a;${openssl_path}/lib/libssl.a"
+  options="$options -DCMAKE_BUILD_TYPE=Release"
+  if [[ $platform = "macOS" ]]; then
+    build="build-${platform}"
+    install="install-${platform}"
+    rm -rf $build
+    mkdir -p $build
+    mkdir -p $install
+    cd $build
+    cmake $td_path $options -DCMAKE_INSTALL_PREFIX=../${install}
+    make -j3 install || exit
+    cd ..
+    mkdir -p $platform
+    cp $build/libtdjson.dylib $platform/libtdjson.dylib
+    install_name_tool -id @rpath/libtdjson.dylib $platform/libtdjson.dylib
+  else
+    simulators="0 1"
+    for simulator in $simulators;
+    do
+      build="build-${platform}"
+      install="install-${platform}"
+      if [[ $simulator = "1" ]]; then
+        build="${build}-simulator"
+	install="${install}-simulator"
+	ios_platform="SIMULATOR"
+      else
+        ios_platform="OS"
+      fi
+      if [[ $platform = "watchOS" ]]; then
+	ios_platform="WATCH${ios_platform}"
+      fi
+      echo $ios_platform
+      rm -rf $build
+      mkdir -p $build
+      mkdir -p $install
+      cd $build
+      echo "A"
+      cmake $td_path $options -DIOS_PLATFORM=${ios_platform} -DCMAKE_TOOLCHAIN_FILE=${td_path}/CMake/iOS.cmake -DCMAKE_INSTALL_PREFIX=../${install}
+      echo "B"
+      make -j3 install || exit
+      cd ..
+    done
+    lib="install-${platform}/lib/libtdjson.dylib"
+    lib_simulator="install-${platform}-simulator/lib/libtdjson.dylib"
+    mkdir -p $platform
+    lipo -create $lib $lib_simulator -o $platform/libtdjson.dylib
+    install_name_tool -id @rpath/libtdjson.dylib $platform/libtdjson.dylib
+   fi
+
+   mkdir -p ../tdjson/$platform/include
+   rsync --recursive ${install}/include/ ../tdjson/${platform}/include/
+   mkdir -p ../tdjson/$platform/lib
+   cp $platform/libtdjson.dylib ../tdjson/$platform/lib/
+done