added Readme

Author: himanshu219

README.md

@@ -11,7 +11,14 @@ This repository contains SumoLogic AWS Lambda extension.
 
 The Sumo Logic lambda extension is available as an AWS public Layer. The latest layer is:
 
-    arn:aws:lambda:<AWS_REGION>:956882708938:layer:sumologic-extension:1
+For x86_64 use:
+
+    arn:aws:lambda:<AWS_REGION>:956882708938:layer:sumologic-extension-amd64:2
+
+For arm64 use:
+
+    arn:aws:lambda:<AWS_REGION>:956882708938:layer:sumologic-extension-arm64:2
+
 
 - AWS_REGION - Replace with your AWS Lambda Region.
 
@@ -20,6 +27,11 @@ All the logs that are not sent to Sumo Logic during the Execution phase of the A
 
 If you would like to always send logs during the execution phase however, you can add extra execution time via a sleep function at the end of lambda code, which will give your extension time to run and send logs to Sumo Logic. We recommend setting this to two seconds.
 
+# Using Lambda extension in custom container images
+
+Follow the instruction in [docs](https://help.sumologic.com/03Send-Data/Collect-from-Other-Data-Sources/Collect_AWS_Lambda_Logs_using_an_Extension#For_AWS_Lambda_Functions_Created_Using_Container_Images:)
+
+Refer [containerimageexample](containerimageexample/python-arm64/) folder To see sample [Dockerfile](containerimageexample/python-arm64/Dockerfile) for python arm64 image.
 
 # Contributing