docs: Update README.md

README.md

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 > 🌎 Get your own proj.sbs subdomains, free for open-source developers. (by Proj.at)
 
+> [!WARNING]
+> `Proj.sbs` Subdomain **service will be ended on October 20th, 2024 (UTC)**. All the subdomains will not be accessible after the service is ended, and the GitHub repository of this project ([`proj-at/subdomains`](https://github.com/proj-at/subdomains)) will be archived. To avoid being affected, you may need to migrate as soon as possible.
+> 
+> We started this project because we would like to make previewing easier for developers so that they can launch their projects, documentation sites, or other open-source websites easily and quickly. However, we found this is not convenient for developers because the process of creating, reviewing, and merging a PR is not efficient. That's one of the main reasons we end this project.
+> 
+> To avoid being affected, you may need to:
+> - Check all your projects or services that is using any domain or subdomain of `proj.sbs`.
+> - If the subdomain is owned by you, you may need to copy your records and change them to your own domain or other services.
+> - If the subdomain is not owned by you, you may need to contact them by using the email information or other contact information that they left in the record file.
+>
+> Thank you for your understanding.
+
+
+---
+
+
 > [!NOTE]  
 > Please note that all the content on Proj.sbs is created by users. **Proj.at is not responsible for its content and opinions.** If the content on it makes you feel uncomfortable, please report it to us. You can send email to *report@proj.sbs* or [click here](https://github.com/proj-at/subdomains/issues/new?assignees=&labels=report&projects=&template=report.md&title=Report)