Add README

README.md

+# Tools for GitLab
+
+Maintainer: Jakob Moser <moser@cl.uni-heidelberg.de>
+
+## 📦 Installation
+
+First, clone the repo and install the dependencies:
+
+```bash
+git clone https://gitlab.cl.uni-heidelberg.de/moser/tools-for-gitlab.git
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+```
+
+Create a file called `.env` in the repository directory, containing the GitLab API URL and an API access token you need to create, e.g., like this:
+
+```
+GITLAB_ACCESS_TOKEN="glpat-N3rDzcY3jq79SVYiU"
+GITLAB_API_URL="https://gitlab.cl.uni-heidelberg.de/api/v4"
+```
+
+## 🔖 `create_labels.py`
+
+Creates a set of labels (by default, the ones contained in `default_labels.json`) for a given project or group. Use like this:
+
+```bash
+source venv/bin/activate
+./create_labels.py --project 1481
+```
+
+Use `./create_labels.py -h` for a list of available options.