Updated README

added link to wiki and pip install command

Author: ecphory

README.md

@@ -1,2 +1,10 @@
-# python_actr
+# Python ACT-R
 A Python implementation of the ACT-R cognitive Architecture
+
+Install Python ACT-R from the command line using either `pip` or `pip3` as follows:
+
+```bash
+pip install python_actr
+```
+
+For details, visit the wiki page: https://github.com/CarletonCognitiveModelingLab/python_actr/wiki/PythonACTRTutorials