add readme

README.md

+# Delete Folder in Coscine
+
+This project includes a short [python script](delete_folder.py) to delete folders from a Coscine resource.
+
+It requires a Coscine API Token which you can create under your [Coscine user profile](https://coscine.rwth-aachen.de/user).
+Enter this in a `.env` file in the same folder as the script, such that:
+
+```text
+COS_TOKEN=MYTOKEN
+```
+
+Replace the placholders with the appropriate information before running the 
+
+Install any missing packages with your preferred method, such as `pip`, e.g., `pip install coscine`, `pip install python.dotenv`.
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