Add wiki sources and iOS instructions in readme. (#126)

* Update README.md

* Update README.md

README.md

@@ -50,7 +50,17 @@ TensorFlow Lite Flutter plugin provides a flexible and fast solution for accessi
 
 3. Use **`sh install.sh -d`** (Linux) or **`install.bat -d`** (Windows) instead if you wish to use these `GpuDelegateV2` and `NnApiDelegate`.
 
-These scripts install pre-built binaries based on latest stable tensorflow release. For info about using other tensorflow versions refer to [this](#use-the-plugin-with-any-tensorflow-version) part of readme.
+These scripts install pre-built binaries based on latest stable tensorflow release. For info about using other tensorflow versions follow [instructions in wiki](https://github.com/am15h/tflite_flutter_plugin/wiki/). 
+
+### iOS
+
+1. Download [`TensorFlowLiteC.framework`](https://github.com/am15h/tflite_flutter_plugin/releases/download/v0.5.0/TensorFlowLiteC.framework.zip). For building a custom version of tensorflow, follow [instructions in wiki](https://github.com/am15h/tflite_flutter_plugin/wiki/). 
+2. Place the `TensorFlowLiteC.framework` in the pub-cache folder of this package.
+
+ Pub-Cache folder location: [(ref)](https://dart.dev/tools/pub/cmd/pub-get#the-system-package-cache)
+
+ - `~/.pub-cache/hosted/pub.dartlang.org/tflite_flutter-<plugin-version>/ios/` (Linux/ Mac) 
+ - `%LOCALAPPDATA%\Pub\Cache\hosted\pub.dartlang.org\tflite_flutter-<plugin-version>\ios\` (Windows)
 
 ### Desktop