Update readme to reflect getting started after project split (#23250)

* Update readme to reflect getting started after project split

* add bin bash to script

README.md

@@ -44,12 +44,12 @@ Explore our [demo app](https://demo.airbyte.io/).
 
 ### Run Airbyte locally
 
-You can run Airbyte locally with Docker.
+You can run Airbyte locally with Docker. The shell script below will retrieve the requisite docker files from the [platform repository](https://github.com/airbytehq/airbyte-platform) and run docker compose for you.
 
 ```bash
 git clone --depth 1 https://github.com/airbytehq/airbyte.git
 cd airbyte
-docker compose up
+./run-ab-platform.sh
 ```
 
 Login to the web app at [http://localhost:8000](http://localhost:8000) by entering the default credentials found in your .env file.
@@ -81,6 +81,8 @@ Sign up for [Airbyte Cloud](https://cloud.airbyte.io/signup).
 
 Get started by checking Github issues and creating a Pull Request. An easy way to start contributing is to update an existing connector or create a new connector using the low-code and Python CDKs. You can find the code for existing connectors in the [connectors](https://github.com/airbytehq/airbyte/tree/master/airbyte-integrations/connectors) directory. The Airbyte platform is written in Java, and the frontend in React. You can also contribute to our docs and tutorials. Advanced Airbyte users can apply to the [Maintainer program](https://airbyte.com/maintainer-program) and [Writer Program](https://airbyte.com/write-for-the-community).
 
+If you would like to make a contribution to the platform itself, please refer to guides in [the platform repository](https://github.com/airbytehq/airbyte-platform)
+
 Read the [Contributing guide](https://docs.airbyte.com/contributing-to-airbyte/).
 
 ## Reporting vulnerabilities

run-ab-platform.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/bash
+
 # Run away from anything even a little scary
 set -o nounset # -u exit if a variable is not set
 set -o errexit # -f exit for any command failure