Add supported architectures to the README

Author: tpoole

README.md

@@ -70,11 +70,11 @@ of the target you wish to build.
 
 #### Deployment Targets
 
-- __macOS__: macOS 10.11
-- __Windows__: Windows 10
-- __Linux__: Mainstream Linux distributions
-- __iOS__: iOS 12
-- __Android__: Android 5 - Lollipop (API Level 21)
+- __macOS__: macOS 10.11 (x86_64, Arm64)
+- __Windows__: Windows 10 (x86_64, x86, Arm64, Arm64EC)
+- __Linux__: Mainstream Linux distributions (x86_64, Arm64/aarch64, (32 bit Arm systems like armv7 should work but are not regularly tested))
+- __iOS__: iOS 12 (Arm64, Arm64e, x86_64 (Simulator))
+- __Android__: Android 5 - Lollipop (API Level 21) (arm64-v8a, armeabi-v7a, x86_64, x86)
 
 ## Contributing