Updated Readme with new layer ARNs for China regions (#271)

Author: mbfreder

README.md

@@ -55,8 +55,16 @@ This works with any base images except AWS managed base images. To use AWS manag
 AWS Lambda Web Adapter also works with AWS managed Lambda runtimes. You need to do three things:
 
 1. attach Lambda Web Adapter layer to your function.
-   1. x86_64: `arn:aws:lambda:${AWS::Region}:753240598075:layer:LambdaAdapterLayerX86:16`
-   2. arm64: `arn:aws:lambda:${AWS::Region}:753240598075:layer:LambdaAdapterLayerArm64:16`
+   #### AWS Commercial Regions
+      1. x86_64: `arn:aws:lambda:${AWS::Region}:753240598075:layer:LambdaAdapterLayerX86:16`
+      2. arm64: `arn:aws:lambda:${AWS::Region}:753240598075:layer:LambdaAdapterLayerArm64:16`
+   #### AWS China Regions
+      1. cn-north-1 (Beijing)
+         - x86_64: `arn:aws-cn:lambda:cn-north-1:041581134020:layer:LambdaAdapterLayerX86:16`
+      2. cn-northwest-1 (Ningxia)
+         - x86_64: `arn:aws-cn:lambda:cn-northwest-1:069767869989:layer:LambdaAdapterLayerX86:16`
+      
+
 2. configure Lambda environment variable `AWS_LAMBDA_EXEC_WRAPPER` to `/opt/bootstrap`.
 3. set function handler to your web application start up script. e.g. `run.sh`.