Create USERS.md (#2700)

# Description

Please provide a summary of the changes, including relevant motivation
and context.

Closes #(issue_number)

## Checklist

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

USERS.md

@@ -0,0 +1,45 @@
+# Who is using Stirling-PDF?
+
+Understanding the diverse applications of Stirling-PDF can be an invaluable resource for collaboration and learning. This page provides a directory of users and use cases. If you are using Stirling-PDF, consider sharing your experiences to help others and foster a community of best practices.
+
+## Adding Yourself as a User
+
+If you're using Stirling-PDF or have integrated it into your platform or workflow, please consider contributing to this list by describing your use case. You can do this by opening a pull request to this file and adding your details in the format below:
+
+- **N**: Name of the organization or individual.
+- **D**: A brief description of your usage.
+- **U**: Specific features or capabilities utilized.
+- **L**: Optional link for further information (e.g., website, blog post).
+- **Q**: Contact information for sharing insights (optional).
+
+Example entry:
+
+```
+* N: Example Corp
+  D: Using Stirling-PDF for automated document processing in our SaaS platform focusing on compression.
+  U: OCR, merging PDFs, metadata editing, encryption, compression.
+  L: https://example.com/stirling-pdf
+  Q: @example-user on Discord/email
+```
+
+---
+
+## Requirements for Listing
+
+- You must represent the entity you're listing and ensure the details are accurate.
+- Trial deployments are welcome if they represent a realistic evaluation of Stirling-PDF in action.
+- Community contributions, including home-lab setups or non-commercial uses, are encouraged.
+
+---
+
+## Users (Alphabetically)
+
+    * N: 
+      D: 
+      U: 
+      L: 
+
+    * N: 
+      D: 
+      U: 
+      L: