Add instructions

Author: rhanajoy

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "githubPullRequests.ignoredPullRequestBranches": [
+        "main"
+    ]
+}

shared/README.md

@@ -4,4 +4,30 @@ The include files may be used for the following values of ms.service:
 
 - dynamics-365
 - industry-solutions
-- power-platform
+- power-platform
+
+Full instructions for [using include files](/help/platform/includes-best-practices?branch=main) are in the Learn contributors guide. Here's a quick summary of how to use the shared content repo for BAP Skilling include files.
+
+1. Create a folder in **MicrosoftDocs/powerapps-docs-pr/shared**.
+
+1. Upload your include file to the folder you created in Step 1.
+
+1. Use the following syntax to insert your include file: `[!INCLUDE [File name](~/../shared-content/shared/filename.md)]`
+
+The following example inserts the file gdpr-intro.md, which is stored in the folder **shared/privacy-includes**: `[!INCLUDE [gdpr-intro](~/../shared-content/shared/privacy-includes/gdpr-intro.md)]`
+
+The following example inserts a lightbox accessibility tip, which is stored at the root level of the **shared** folder: `[!INCLUDE [Lightbox tip](~/../shared-content/shared/lightbox-tip.md)]`
+
+## A note about images in include files
+
+Images that should appear in an include file can't be stored in the shared content repo (MicrosoftDocs/powerapps-docs-pr/shared).
+
+Instead, store the image files in **MicrosoftDocs/powerapps-docs-pr/powerapps-docs/media** and call them like this: `source="/power-apps/media/filename.png"`
+
+### Why does the shared content repo live in the powerapps-docs-pr repo?
+
+It's a long story. The TL;DR: is that powerapps-docs-pr is already set up for all the languages we localize our docs in. Lots of extra work would have been required to localize files stored in, say, MicrosoftDocs/reusable-content.
+
+### Where can I get help with the shared content repo?
+
+Submit a Content Engineering request.