Update DEVELOPER.md

DEVELOPER.md

@@ -1,5 +1,30 @@
 # Service Screener Developer Guide
 
+## Preparation on Mac environment
+```bash
+
+## Install homebrew
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+# PLEASE READ
+# FOLLOW THE 'NEXT STEP' shows after installation
+# THERE ARE 2 COMMANDS TO COPY/PASTE to set the environment variables correctly
+
+## Install Python, and set the alias in ~/.zprofile or ~/.bash_profile
+brew install [email protected]
+which python3.12
+alias python3=... <to the path above>, #also setup this in ~/.zprofile?
+
+## Install AWS CLI
+curl "https://awscli.amazonaws.com/AWSCLIV2.pkg" -o "AWSCLIV2.pkg"
+sudo installer -pkg AWSCLIV2.pkg -target /
+
+# Setup AWS Profile
+aws configure --profile ss
+
+## When executing SS locally
+screener --regions ap-southeast-1 --profile ss
+```
+
 ## Pre-requisite
 1. git account
 1. fork the master repository from aws-samples
@@ -8,12 +33,3 @@
 1. Setup necessary IAM Users with readOnly permission. 
 1. Generate Accesskey & Secret combination to be used by local machine
 1. Run ```aws configure --profile <name>``` and follow through the setup wizard
-
-## Preparation on Mac environment
-```bash
-# You may opt-in to develop in other PHP version, the following guide is to 
-brew install [email protected]
-php -v # make sure it is version 7.4 
-
-## Then you may follow the official instruction to install composer & php-sdk
-```