doc: Include basic usage file for testing tools

tests/usage.md

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+
+# QED benchmarking tools
+
+## Requirements:
+* Dialog
+* Gnuplot
+* Vegeta
+* Wrk
+
+## Latency test
+```
+./stress-latency-60s
+```
+This will run an latency benchmark with Vegeta for 60s by default and output plot.html.
+
+## Throughput test
+```
+./stress-throughput-60s
+```
+This script run an throughtput benchmark using Wrk for 60 by default and outputs the results in your terminal.
+
+## Endurance test
+```
+PROFILING=true ./stress -add -n 1000000
+```
+It will bring up the server and execute and insert 1M events with default concurrency of 10 connections. Also will start a go profiling tool to collect all internal data of QED server an save it in 'results' directory.
+The througput will be also displayed every second. 
+The graph is saved in 'results/graph-Add-$number_events.png (results/graph-Add-1000000.png)'.
+
+This script use 'riot.go'. It's a tool we've develop to stress QED. It's also capable of generating charts, start with specific offset or even run Membership|Incremental Proofs for the events into QED.
+
+If you install Dialog and Gnuplot you can generate usage graphs for each function collected by Golang pprof tool. ei:
+```
+./make_graph results
+```
+
+
+
+
+
+
+