add README

README.md

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+# vat2ful
+
+An EU VAT rate importer for [fulcrm](https://fulcrm.org/).
+
+## Installation
+
+```pipenv install```
+
+## Configuration
+
+1. Create an account at [vaylayer](https://vatlayer.com/).
+
+2. Create `settings.py` containing:
+
+```python
+FULCRM_USER = "fulcrm_username_here"
+FULCRM_API_KEY = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+VATLAYER_API_URL = "http://apilayer.net/api/rate_list?access_key=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX&format=1"
+```
+
+## Usage
+
+```pipenv run ./vat2ful```