add README.md with 'Getting started' section

add .env.example

add requierements.txt

.env.example

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+HETZNER_API_TOKEN=

README.md

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+## Getting started
+
+0. Install Python.
+1. Create virtual environment: `python3 -m venv .venv`.
+2. To activate the virtual environment, enter: `source .venv/bin/activate`.
+3. Install a list of requirements specified in [requirements.txt](./requirements.txt):
+   `python -m pip install -r requirements.txt`.
+4. Create a .env file `cp .env.example .env` and provide values of envirnoment variables.
+5. Run the script: `python main.py`.
+
+> When you're finished with your virtual environment, enter the following command to deactivate it: `deactivate`.

requirements.txt

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+python-dotenv
+hcloud