add a table with the plugins that will be adapted

README.md

 # simplemail-plugins
 Simplemail plugins still not integrated but with some fixed for roundcube releases (0.9, 1.0 and 1.2)
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+
+# Plugins in repository
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+
+       plugin               |              original name  | 0.9 | 1.0 | 1.2 | url 
+--------------------------- | ----------------------------|-----|-----|-----|------
+ twofactor_gauthenticator   | twofactor_gauthenticator    |  no | si  | si  | https://github.com/alexandregz/twofactor_gauthenticator