updated readme

readme.md

@@ -0,0 +1,25 @@
+Needs Python 3
+
+Activate virtual environment:
+```bash
+python3 -m venv venv
+```
+
+Enter virtual environment:
+```bash
+#bash
+source venv/bin/activate
+#fish
+source venv/bin/activate.fish
+```
+
+Install pygame:
+```bash
+pip install -r requirements.txt
+```
+
+Start game:
+```bash
+python3 main.py
+```
+