Add readme to the AWS native sample

spring-cloud-function-samples/function-sample-aws-native/README.md

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+# To run
+
+## If you are on OSX Apple M1 Pro (arch64)
+
+You first need to build a Docker image where you will actually build project.
+To do that execute the following command form [project directory
+
+```
+$ docker build -t "al2-graalvm19:native-uppercase" .
+```
+Start the container
+
+```
+$ docker run -dit al2-graalvm19:native-uppercase
+ ```
+ 
+Now navigate to the image terminal. Your working directory is alredy set for the root of the project. You can verify it by executing `ls`.
+
+Build the project:
+
+```
+./mvnw clean -Pnative native:compile -DskipTests
+```
+
+Once the build finishes, you can deploy it. 
+
+## Deploying to AWS LAmbda
+
+Start *AWS Dashboard* and navigate to **AWS Lambda** Services
+
+Click on `Create Function`.  Enter `uppercase` for *function name*. For the runtime select `Provide your own bootstrap on Amazon Linux 2`. Make sure you select the proper architecture (`x86_64` or `arm64`). 
+
+Click on `Create Function` again.
+
+Next you need to upload your project, so click on `Upload From` and point to the ZIP file that was created by the build process (in the target directory).
+
+Once the file is uploaded navigate to the `Test` tab. YOu can change the input data or use the default. Basically you need to pas a String in a JSON format such as "hello" and you should see the output "HELLO".