Create USER_SUBMITTED_GUIDES.md

In order to contribute a guide on installing with Proxmox VE Helper Scripts, you should open a pull request that adds the guide to the `USER_SUBMITTED_GUIDES.md` file.

USER_SUBMITTED_GUIDES.md

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+<h1><p align="center"> User Submitted Guides </a></p></h1>
+
+<sub> In order to contribute a guide on installing with Proxmox VE Helper Scripts, you should open a pull request that adds the guide to the `USER_SUBMITTED_GUIDES.md` file. </sub>
+
+[Installing Home Assistant OS using Proxmox 7](https://community.home-assistant.io/t/installing-home-assistant-os-using-proxmox-7/201835)
+