add blobs server scalability tests results

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diff --git a/server-scalability/README.txt b/server-scalability/README.txt
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+Blobs Server Scalability Tests Results
+======================================
+
+These are results obtained by running the blobs scalability tests that can be
+found in:
+
+  https://0xacab.org/leap/soledad/tree/master/scripts/scalability
+
+Overview
+--------
+
+The blobs server scalability tests aim to find the maximum amount of parallel
+blobs upload and download requests that the server is able to respond to. We
+use FunkLoad[1] to launch an increasing number of parallel upload/download
+requests and to create reports with a summary of the results. The metrics
+obtained are:
+
+- The number of Successful Tests Per Second given the number of Concurrent
+  Users.
+
+- The number of Successful Pages Per Second given the number of Concurrent
+  Users. A Page in the context of FunkLoad is a request to the server. For
+  tests that have only one Page request, this number is the same as the above.
+
+- The total number of Requests Per Second (successful or not) given the number
+  of Concurrent Users.
+
+- Graphs with the associated response times.
+
+[1] https://funkload.nuxeo.org/
+
+
+Scenarios
+---------
+
+The size of the uploaded/downloaded blobs and the client and server bandwidth
+are parameters that highly influence the results of these tests. See the file
+results/README.txt for information on the scenario used for each test.