Updated README to explain branch differences.

Author: naithar

README.md

@@ -1,5 +1,7 @@
 # Godot iOS plugins
 
+`master` branch is current development branch and can introduce breaking changes to plugin's public interface. 
+`3.2` branch aim is to provide same public interface as it was before switch to new iOS plugin system. 
 
 ## Instructions
 
@@ -46,4 +48,4 @@
 
 * Run `./scripts/generate_xcframework.sh <plugin_name> <debug|release|release_debug> <godot_version>`  to generate `xcframework` with specific configuration. `xcframework` allows plugin to support both `arm64` device and `arm64` simulator.
 
-* The result `.xcframework` will be stored in `bin` folder as well as intermidiate `.a` binaries.
+* The result `.xcframework` will be stored in `bin` folder as well as intermidiate `.a` binaries.