Add layers option to readme (#481)

* Add example to help of layers option

* Add layers option to README

Author: abetomo

README.md

@@ -84,6 +84,7 @@ AWS_FUNCTION_VERSION       // (default: '')
 AWS_VPC_SUBNETS            // (default: '')
 AWS_VPC_SECURITY_GROUPS    // (default: '')
 AWS_TRACING_CONFIG         // (default: '')
+AWS_LAYERS                 // (default: '')
 AWS_LOGS_RETENTION_IN_DAYS // (default: '')
 EVENT_FILE                 // (default: 'event.json')
 PACKAGE_DIRECTORY          // (default: not set)
@@ -181,6 +182,7 @@ Options:
   -K, --kmsKeyArn []                  Lambda KMS Key ARN
   -Q, --deadLetterConfigTargetArn []  Lambda DLQ resource
   -c, --tracingConfig []              Lambda tracing settings
+  -l, --layers []                     Lambda Layers settings (e.g. "ARN1,ARN2[,..])" (default: "")
   -R, --retentionInDays []            CloudWatchLogs retentionInDays settings
   -A, --packageDirectory [build]      Local Package Directory
   -G, --sourceDirectory []            Path to lambda source Directory (e.g. "./some-lambda")

bin/node-lambda

@@ -91,7 +91,7 @@ program
     AWS_DLQ_TARGET_ARN)
   .option('-c, --tracingConfig [AWS_TRACING_CONFIG]', 'Lambda tracing settings',
     AWS_TRACING_CONFIG)
-  .option('-l, --layers [AWS_LAYERS]', 'Lambda Layers settings', AWS_LAYERS)
+  .option('-l, --layers [AWS_LAYERS]', 'Lambda Layers settings (e.g. "ARN1,ARN2[,..])"', AWS_LAYERS)
   .option('-R, --retentionInDays [AWS_LOGS_RETENTION_IN_DAYS]', 'CloudWatchLogs retentionInDays settings',
     AWS_LOGS_RETENTION_IN_DAYS)
   .option('-A, --packageDirectory [PACKAGE_DIRECTORY]', 'Local Package Directory', PACKAGE_DIRECTORY)