add green theme

theme/theme.py

@@ -0,0 +1,10 @@
+import gradio as gr
+from toolbox import get_conf
+THEME, = get_conf('THEME')
+
+if THEME == 'Green':
+    from .green import adjust_theme, advanced_css
+else:
+    from .default import adjust_theme, advanced_css
+
+