Create extension_summary.rst

source/status/extension_summary.rst

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+##################
+Extension Summary
+##################
+
+Summary of extension activity per domain such as misssed calls, answered calls, no answer, inbound duration, outbound duration, number of outboud calls, number of inbound calls and Average length of Conversation (ALOC). The summarized information can be downloaded as a CSV file.
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+
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+.. image:: ../_static/images/fusionpbx_extension_summary.jpg
+        :scale: 85%