readme update

README

+Shower
+
+    Сross-browser presentation template
+
+Supported Browsers
+
+    • Opera
+    • Firefox
+    • Chrome
+    
+    Presentation is backward compatible, but the best experience available
+    in the latest stable versions of mentioned browsers.
+
+Planned Support
+
+    • Safari
+    • Internet Explorer
+    • …
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