Start a few READMEs in src (#36125)

src/automated-pipelines/README.md

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+# Automated pipelines
+
+Our automated pipelines directory contains code shared by our automated pipelines, including REST, GraphQL, Webhooks, CodeQL, and GitHub Apps.
+
+## What is automated pipelines
+
+An automated pipeline adds automatically generated content to docs.github.com
+
+## How does it work
+
+## How to get help

src/codeql-cli/README.md

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+# CodeQL CLI
+
+Our CodeQL CLI pipeline adds automated documentation on docs.github.com.
+
+## What is CodeQL CLI
+
+CodeQL is an intelligent code scanning service that checks for security issues in code.
+
+## How does it work
+
+## How to get help

src/github-apps/README.md

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+# GitHub Apps
+
+Our GitHub Apps pipeline adds automated documentation for GitHub Apps.
+
+## What is GitHub Apps
+
+GitHub Apps is a GitHub product that allows custom applications to respond to events on GitHub.
+
+## How does it work
+
+## How to get help