Documentation updated.

docs/installation.md

@@ -14,6 +14,14 @@ pip install -U pip setuptools wheel
 pip install --index-url https://pypi.clarin-pl.eu/simple combo==1.0.1
 ```
 
+### Conda example:
+```bash
+conda create -n combo python=3.8
+conda activate combo
+pip install -U pip setuptools wheel
+pip install --index-url https://pypi.clarin-pl.eu/simple combo==1.0.1
+```
+
 ## Problems & solutions
 * **jsonnet** installation error