Updated contributing instructions to include changing PR template

Author: igorski-r7

.github/PULL_REQUEST_TEMPLATE/contrib.md

@@ -75,7 +75,7 @@ If you have access to an InsightConnect instance, please provide:
 Please review our [style guide](https://docs.rapid7.com/insightconnect/style-guide/) and check all that apply:
 - [ ] Dependencies pinned in `Dockerfile` ([OS packages](https://docs.rapid7.com/insightconnect/style-guide/#dockerfile)) and `requirements.txt` ([Python packages](https://docs.rapid7.com/insightconnect/style-guide/#requirements.txt))
 - [ ] `USER nobody` set in `Dockerfile` for least privileged account
-- [ ] Uses [slim SDK images](https://docs.rapid7.com/insightconnect/sdk-guide/#sdk-guide) when possible (e.g., `rapid7/insightconnect-python-3-38-slim-plugin:{sdk-version-num}`)
+- [ ] Uses [slim SDK images](https://docs.rapid7.com/insightconnect/sdk-guide/#sdk-guide) when possible (e.g., `rapid7/insightconnect-python-3-slim-plugin:{sdk-version-num}`)
 - [ ] Uses [PluginException](https://docs.rapid7.com/insightconnect/error-handling-in-integrations/#plugin-exceptions) / [ConnectionTestException](https://docs.rapid7.com/insightconnect/error-handling-in-integrations#connection-exceptions) for errors
 - [ ] Uses `self.logger` for [logging](https://docs.rapid7.com/insightconnect/sdk-guide/#logging)
 - [ ] Changelog updated ([style guide](https://docs.rapid7.com/insightconnect/style-guide/#changelog))

CONTRIBUTING.md

@@ -33,6 +33,24 @@ it into production.  If you do not care to follow these rules, your contribution
 - **Don't** leave your pull request description blank.
 - **Don't** abandon your pull request. Being responsive helps us land your code faster.
 
+#### Using the Contributor PR Template (External Contributors)
+
+**If you're contributing from a fork**, please use our specialized contributor template that includes additional validation sections. Here's how:
+
+1. When you click "Compare & Pull request" on GitHub after pushing your changes, you'll see a URL like:
+   ```
+   https://github.com/rapid7/insightconnect-plugins/compare/master...your-username:your-branch
+   ```
+
+2. Before clicking "Create pull request", add `?template=contrib.md` to the end of the URL:
+   ```
+   https://github.com/rapid7/insightconnect-plugins/compare/master...your-username:your-branch?template=contrib.md
+   ```
+
+3. Press Enter to reload the page with the contributor template pre-filled.
+
+This template includes sections for plugin validation outputs, connection tests, and code quality checklists that help us review external contributions more efficiently.
+
 #### New Features
 
 - **Do** install validator dependencies necessary to run `make validate` to find and fix any errors or warnings that come up.