Add native web sample

Initial README for sample of native web workloads

Update bootstrap in sample

spring-cloud-function-samples/function-sample-aws-serverless-web-native/src/shell/java/bootstrap

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+cd ${LAMBDA_TASK_ROOT:-.}
+
+java -Dspring.main.web-application-type=none -Dlogging.level.org.springframework=DEBUG \
+  -noverify -XX:TieredStopAtLevel=1 -Xss256K -XX:MaxMetaspaceSize=128M \
+  -cp .:`echo lib/*.jar | tr ' ' :` com.example.demo.DemoApplication