update README*2

README.md

@@ -15,3 +15,34 @@ will be rendered as:
 ```html
 <del>some_text here</del>
 ```
+
+## Usage
+
+### Install
+You can install with pip:
+
+```bash
+pip install sphinxcontrib-del-marker
+```
+
+### Configure
+and add it to `sphinx conf.py`:
+
+```python
+# conf.py
+...
+extensions = ["sphinxcontrib_del_marker"]
+...
+```
+
+### Use
+
+with directive:
+```rst
+.. del:: lorem lorem lorem
+```
+
+
+## Roadmap
+
+- [ ] using with sphinx `role`