Update README.md

README.md

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 # agate-extension
-Web extension that sums up Agate clockings
+This web extension integrates into Agate and adds a new section to the clockings summary of the current month. This section contains the following metrics :
+  - The effective work time, including break time and time since the last clock-in.
+  - The remaining work time.
+  - The end-of-day time. (assuming a break time of 45 min if it's not taken yet)
+  - The state of your work time as of previous day, including hours transferred from the previous month.
+
+# Browser support
+  - Chrome > 49
+  - Firefox > 34
+  - Edge > 14
+
+# Installation
+No packaged version yet, download the repository and use developper mode to test it out.