[mac_contributing_info] Add instructions for Native Image build on MAC (

apache#2625)

* [mac_contributing_info] Add instructions for Native Image build on MAC

* [mac_contributing_info] Fix as per PR suggestion

CONTRIBUTING.md

@@ -138,6 +138,7 @@ If you have not done so on this machine, you need to:
 * Install Git and configure your GitHub access
 * Install Java SDK (OpenJDK recommended)
 * For Native Image, follow Quarkus instructions at [GraalVM](https://quarkus.io/guides/building-native-image)
+* On MAC, check [Setup MAC for Native image build](./Develop_on_Mac.md) for further instructions.
 
 Docker is not strictly necessary, but it is a required to run some of the integration tests. 
 These tests can be skipped (see the [Build](#build) section), but we recommend to install it to run these tests locally.

Develop_on_Mac.md

@@ -0,0 +1,12 @@
+Setup MAC for Native image build
+================================
+
+The following instructions use sdkman as jvm manager. While it is not mandatory, it is recommended to ease jvm switching during development. 
+
+1. install sdkman: `curl -s "https://get.sdkman.io" | bash` 
+2. install brew: `/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`
+3. manually install GraalVM (Note: check [Quarkus documentation](https://quarkus.io/guides/building-native-image#configuring-graalvm) to get current supported version): `brew install --cask graalvm/tap/(*current_graalvm_version*)`
+4. link GraalVM inside sdkman: `sdk install java (*current_graalvm_version*)-grl /Library/Java/JavaVirtualMachines/(*current_graalvm_version*)/Contents/Home` 
+5. go to directory containing code for native build
+6. set sdkman to use GraalVM: `sdk use java (*current_graalvm_version*)-grl` 
+7. issue build: `mvn clean package -Pnative`