Added some content to the README

README.md

@@ -1,3 +1,59 @@
 # smartchg
 
-TODO
+[![GitHub main workflow](https://img.shields.io/github/actions/workflow/status/dmotte/smartchg/main.yml?branch=main&logo=github&label=main&style=flat-square)](https://github.com/dmotte/smartchg/actions)
+[![PyPI](https://img.shields.io/pypi/v/smartchg?logo=python&style=flat-square)](https://pypi.org/project/smartchg/)
+
+:snake: DCA-based asset **exchange algorithm**.
+
+## Installation
+
+This utility is available as a Python package on **PyPI**:
+
+```bash
+pip3 install smartchg
+```
+
+## Usage
+
+There are some files in the [`example`](example) directory of this repo that can be useful to demonstrate how this tool works, so let's change directory first:
+
+```bash
+cd example/
+```
+
+We need a Python **virtual environment** ("venv") with some packages to do the demonstration:
+
+```bash
+python3 -mvenv venv
+venv/bin/python3 -mpip install -r requirements.txt
+```
+
+Now we need to **fetch data** related to some asset. To do that, we can use https://github.com/dmotte/misc/blob/main/python-scripts/ohlcv-fetchers/yahoo-finance.py.
+
+TODO if needed (please check), note here that more than 1 year of data is needed
+
+> **Note**: in the following commands, replace the local path of the `invoke.sh` script with the correct one.
+
+```bash
+~/git/misc/python-scripts/ohlcv-fetchers/invoke.sh yahoo-finance '^GSPC' -i1d -d2020-01-01T00Z -f'{:.6f}' > ohlcv-SPX500.csv
+```
+
+TODO complete this part. You can take inspiration from apycalc
+
+For more details on how to use this command, you can also refer to its help message (`--help`).
+
+## Development
+
+If you want to contribute to this project, you can install the package in **editable** mode:
+
+```bash
+pip3 install -e . --user
+```
+
+This will just link the package to the original location, basically meaning any changes to the original package would reflect directly in your environment ([source](https://stackoverflow.com/a/35064498)).
+
+If you want to run the tests, you'll have to install the `pytest` package and then run:
+
+```bash
+pytest test
+```