doc: updated readme

Author: williamabreu

README.md

@@ -1,3 +1,35 @@
-# kingdom_core
+# 🏰 Kingdom Core
 
 Library containing the core modules for the kingdom-python-server.
+
+## Installation
+
+Use the package manager [pip](https://pip.pypa.io/en/stable/) to install `kingdom-core`.
+
+```bash
+pip install kingdom-core
+```
+
+You can use [poetry]() as well.
+
+```bash
+poetry add kingdom-core
+```
+
+## Usage
+
+```python
+from kingdom_core.utils import files
+
+orm_files = files.find("orm.py", "/")
+```
+
+## Contributing
+Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
+
+Please make sure to update tests as appropriate.
+
+## License
+[MIT](https://choosealicense.com/licenses/mit/)
+
+> This file is based on [Make a README](https://www.makeareadme.com/).