Merge pull request #179 from matrix-org/update-install-instructions

docs: Update install instructions

README.md

@@ -25,6 +25,14 @@ Installing pantalaimon works like usually with python packages:
 
     python setup.py install
 
+or you can use `pip` and install it with:
+```
+pip install .[ui]
+```
+
+It is recommended that you create a virtual environment first or install dependencies
+via your package manager. They are usually found with `python-<package-name>`.
+
 Pantalaimon can also be found on pypi:
 
     pip install pantalaimon