Added basic README.

README.md

@@ -0,0 +1,24 @@
+# Usage
+
+A simple way to create a comparison:
+
+```sh
+# Clone this repository.
+git clone https://github.com/StrajnarFilip/analyze-sport-data
+# Change directory into repository.
+cd analyze-sport-data/
+# Copy any amount of FIT or TCX files into this directory.
+cp /home/example/example.fit .
+cp /home/example/example.tcx .
+# Install this package.
+python -m pip install .
+# Alternatively you can install using poetry:
+# poetry install
+
+# Run included example.py script:
+python example.py
+# Alternatively you can run the script using poetry:
+# poetry run python example.py
+```
+
+![Example](https://github.com/StrajnarFilip/analyze-sport-data/blob/master/example.png?raw=true)