chore(README): Update README with more clear instructions on using Security Extension with run-gemini-cli (#89)

Author: CallumHYoung

README.md

@@ -39,13 +39,23 @@ By default, the `/security:analyze` command determines the scope of the analysis
 
 ## GitHub Integration
 
-Integrate the Gemini CLI Security Extension into your GitHub worklfow for analyzing incoming code can be done with the following:
+### I already use [run-gemini-cli](https://github.com/google-github-actions/run-gemini-cli) workflows in my repository:
 
-* Base your workflow off of the [google-github-actions/run-gemini-cli GitHub Action](https://github.com/google-github-actions/run-gemini-cli)
-* Ensure that the [gemini-cli-extensions/security](https://github.com/gemini-cli-extensions/security) extension is passed to the action for installation.
-* Pass `/security:analyze-github-pr` as the prompt to invoke the Security Extension!
+* Replace your existing `gemini-review.yml` with this [updated workflow](https://github.com/gemini-cli-extensions/security/blob/main/.github/workflows/gemini-review.yml), which includes the new Security Analysis step.
 
-See this [Example Workflow](https://github.com/gemini-cli-extensions/security/blob/main/.github/workflows/github-review.yml)
+### I don't use [run-gemini-cli](https://github.com/google-github-actions/run-gemini-cli) workflows in my repository yet:
+
+1. Integrate the Gemini CLI Security Extension into your GitHub workflow to analyze incoming code:
+
+2. Follow Steps 1-3 in this [Quick Start](https://github.com/google-github-actions/run-gemini-cli?tab=readme-ov-file#quick-start).
+
+3. Create a `.github/workflows` directory in your repository's root (if it doesn't already exist).
+
+4. Copy this [Example Workflow](https://github.com/gemini-cli-extensions/security/blob/main/.github/workflows/gemini-review.yml) into the `.github/workflows` directory. See the run-gemini-cli [configuration](https://github.com/google-github-actions/run-gemini-cli?tab=readme-ov-file#configuration) to make changes to the workflow.
+
+5. Ensure the new workflow file is committed and pushed to GitHub.
+
+6. Open a new pull request, or comment `@gemini-cli /review` on an existing PR, to run the Gemini CLI Code Review along with Security Analysis.
 
 ## Benchmark