add readme.md

README.md

+django simpleui demo.
+---
+
+## setup
+
+```
+    #runserver
+    python manage.py runserver 8000
+    
+    #open browser
+    http://127.0.0.1:8000/admin
+    
+    #username and password
+    simpleui 123456
+    
+``` 
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