improve README

README.md

@@ -6,6 +6,30 @@ Based on [https://github.com/chartbeat-labs/textacy](Textacy)'s `preprocess`.
 
 `pip install -U git+https://github.com/jfilter/clean-text#egg=cleantext`
 
+## Development
+
+-   install [Pipenv](https://pipenv.readthedocs.io/en/latest/)
+-   ```bash
+    git clone https://github.com/jfilter/clean-text && cd clean-text && pipenv install
+    ```
+-   to run test: ```bash
+    pipenv run pytest
+
+```
+
+## Contributing
+
+If you have a **question**, found a **bug** or want to propose a new **feature**, have a look at the [issues page](https://github.com/jfilter/clean-text/issues).
+
+**Pull requests** are especially welcomed when they fix bugs or improve the code quality.
+
+If something breaks, consider adding a [test](https://github.com/jfilter/clean-text/tree/master/tests) with your specific input.
+
+## Acknowledgements
+
+Built upon the work by [Burton DeWilde](https://github.com/bdewilde)'s [Textacy](https://github.com/chartbeat-labs/textacy).
+
 ## License
 
 Apache
+```