Update readme to point to other repos (microsoft#25593)

Co-authored-by: aholstrup1 <[email protected]@users.noreply.github.com>

README.md

@@ -1,4 +1,4 @@
-# Microsoft AL application foundation modules and application add-ons for Microsoft Dynamics 365 Business Central
+# Microsoft AL application add-ons for Microsoft Dynamics 365 Business Central
 Welcome to the ALAppExtension repository!
 
 This repo is a platform for Microsoft and our vibrant partner channel and community to work together to develop add-on apps in the AL language and to enable the general extensibility of Microsoft Dynamics 365 Business Central.
@@ -9,10 +9,20 @@ We’re working to make the core application thinner, more extensible, and easie
 
 Microsoft will ship the contributions in upcoming releases of [Microsoft Dynamics 365 Business Central](https://dynamics.microsoft.com/en-us/business-central), where you’ll get to enjoy the effect of your contributions.
 
+## Contributing
+
+In this repository, we welcome contributions to **Microsoft's application add-ons**.
+
+* If you are looking to contribute to the **System Application** or **Developer Tools** you can do so in the [BCApps](https://github.com/microsoft/BCApps) repository. 
+* If you are looking to contribute to the **Base Application** you can do so in the [BusinessCentralApps](https://github.com/microsoft/BusinessCentralApps/) repository. Please note, that this repository is private but you can request access by filling out [this form](https://forms.office.com/pages/responsepage.aspx?id=v4j5cvGGr0GRqy180BHbR_Qj5hjzNeNOhBcvBoRIOltUOVBVTklZN1hBOTZJUU40OE5CUzNWNk1FQy4u). 
+
+
+**⚠IMPORTANT⚠:**  This is not the right place to report product defects with customer impact to Microsoft! Issues created in this repository might not get picked up by the Microsoft engineering team and issues reported in this repository do not fall under SLAs (Service Level Agreements) and hence have no guaranteed time to mitigation, just as provided fixes won't get backported to all supported versions of the product.
+
 ## Types of engagements
 There are a couple of ways to engage with us here:  
 
-* You can grab the code and contribute to the published modules and apps. For more information, see the [_Contributing_](./CONTRIBUTING.md) guidelines or watch this video: [_The Contribution Process_](https://youtu.be/a1p8fTFPVwI?t=3496).
+* You can grab the code and contribute to the published apps. For more information, see the [_Contributing_](./CONTRIBUTING.md) guidelines or watch this video: [_The Contribution Process_](https://youtu.be/a1p8fTFPVwI?t=3496).
 * If you’re building your own app and need something specific from us, like an event, you can help improve the general extensibility of the business logic. For more information, see the [_Extensibility requests_](#extensibility-requests) section below.