Update README with installation instructions

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 Simple Python library to generate pseudo-random alphanumeric strings of
 arbitrary length. Requires Python 3.6+.
 
+## Installation
+
+alphanum can be obtained from PyPI with `pip install alphanum`.
+
+Alternatively, build it with [Poetry](https://python-poetry.org/):
+
+```bash
+pip install poetry
+git clone https://github.com/clpo13/alphanum
+cd alphanum
+poetry build
+pip install dist/alphanum-x.y.z-py3-none-any.whl
+```
+
 ## Usage
 
 ```python