doc: add a section about dependencies in gradio sdk spaces in README.md

README.md

@@ -57,3 +57,27 @@ Right now (July 2024) huggingface let use ZeroGPU Nvidia A100 GPUs.
 
 See [LISA](https://github.com/dvlab-research/LISA) for details on the original project.
 Note that the authors don't keep the project updated anymore.
+
+## Dependencies and HuggingFace demos with Gradio SDK
+
+HuggingFace demos based on Gradio SDK (you need that to use ZeroGPU hardware) needs updated requirements.txt.
+You can keep your requirements.txt in sync with the dependencies installed in the project using this python 
+command (from samgis-core):
+
+```bash
+python -m samgis_core.utilities.update_requirements_txt --req_no_version_path requirements_no_versions.txt --req_output_path requirements.txt
+```
+
+About the parameters:
+
+- input argument `--req_no_version_path` is a file with the dependencies package list without version declared
+- output argument `--req_output_path` is the output requirements.txt
+
+This command simply freeze the installed packages and filter it using the dependencies package list from the input argument.
+If you need to modify the `requirements_no_versions.txt` file, avoid inserting
+
+- `python` (this is required only by `poetry`)
+- `gradio`, `gradio-client` (installed directly by HuggingFace, selecting the version in header section of the README.md file)
+- `spaces` (installed directly by HuggingFace, version selected connected by the gradio version)
+
+In case of doubt check the HuggingFace container log for the correct `spaces` package version.