take cwd as base directory

README.md

@@ -13,11 +13,17 @@ python -m venv .venv
 source .venv/bin/activate
 ``` 
 
-Build and install executable:
+Build executable:
 
 ```bash
-python setup.py build
-python setup.py install
+pip install --upgrade build
+python -m build
+```
+
+Install the executable:
+
+```bash
+pip install .
 ```
 
 See where it is installed:
@@ -27,6 +33,13 @@ which invoice
 
 ## usage
 
+```bash
+invoice -h
+
+
+
+```
+
 There are two yaml files describing your invoice:
 
 - `invoice.yaml` contains the invoice data