add notes regarding asset path

README.md

@@ -82,6 +82,8 @@ y+ │         ├────────────────►▼ ┌─
 ### Implementation notes
 - You may assume all parameters passed to this API are always valid.
 - When converting from a floating point to integer (unit pixel), truncate it instead of rounding.
+- Use environment variable `ASSET_PATH_RO` to locate the assets directory, on the benchmark machine this directory would be set to READ_ONLY (as this will be shared with the other participants).
+- If you need to write to disk, use the OS temporary directory.
 
 ## 3. Evaluation Criteria
 
@@ -108,6 +110,8 @@ There is no single numerical score. The final results will be presented as a **c
 *   **Technology Stack:** The REST API **must** be built using **ASP.NET**. You are free to use any open-source libraries (e.g., for image processing) as you see fit.
 *   **A Note on Setup Simplicity:** Your repository **must** contain a clear `README.md` file with simple, step-by-step instructions on how to build and run your project. **The easier you make it for me to run your code, the better.** I will not spend significant time debugging complex or undocumented setups.
 
+**! Plese do not check in the provided assets in the git repository**
+
 ## 5. Rules & Fair Play
 
 I know it's for fun but it's a good thing to have rules.