chore: Create PLUGIN-UPDATE.md

Author: shdwmtr

.github/PULL_REQUEST_TEMPLATE/PLUGIN-UPDATE.md

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+<!--  
+  📌 **Before You Submit: Please Read Carefully**
+
+  This template is **only** for submitting a **plugin update** to the store.  
+  If you're doing anything else (e.g., submitting a plugin), please start over and select the appropriate PR template.
+
+  Make sure you have:
+  - (Optional, Highly encouraged) Tested and left feedback on **two other plugin PRs**.
+  - Replaced **REPLACE_WITH_PLUGIN_NAME** and **REPLACE_WITH_SUMMARY**.
+  - Completed the **Task Checklist**, including all Yes/No questions.
+-->
+
+# REPLACE_WITH_PLUGIN_NAME
+
+<!--  
+  Briefly describe what changed
+  If relevant, include screenshots, videos, or comparisons to similar plugins. 
+-->
+
+REPLACE_WITH_UPDATE_SUMMARY
+
+
+
+## Task Checklist
+
+### Developer
+
+- [ ] I am the original author or an authorized maintainer of this plugin.
+- [ ] I have complied with all license requirements for the libraries used, including providing appropriate notices where necessary.
+- [ ] My plugin is entirely FOSS and doesn't rely on any external paid services provided (unless incredibly well known and trusted, and you or anyone you know doesn't profit on it).  
+
+### Plugin Functionality
+
+- [ ] I have tested the plugin on both the **Stable** and **Beta** SteamOS update channels.
+
+### Backend Configuration
+
+* **Yes/No**: I use a standard Millennium python backend in my plugin.
+* **Yes/No**: I use **custom binaries** that or rely on other FOSS projects that aren't written directly using Millennium's python backend. 
+
+### Community Contribution
+
+<!--  
+  Link to your feedback on two plugin PRs in a comment on this PR.  
+  This step is optional but strongly encouraged — plugin PRs without testing contributions may be reviewed more slowly.  
+-->
+
+- [ ] I have tested and left feedback on **two** other plugin pull requests.
+- [ ] I have added links to those feedback comments in this PR.
+
+---
+
+## Testing Instructions
+
+<!--  
+  DO NOT CHECK THESE YOURSELF.  
+  A third-party tester will check the appropriate box below **after verifying** your plugin.
+-->
+
+- [ ] Verified by a third party on **Steam Client Stable**.
+- [ ] Verified by a third party on **Steam Client Beta**.