E2E load tests example scenarios

Introduce examples of scenarios to show how to load test Gerrit
using Gatling.

This initial examples only include tests over the git protocol, however
it is possible to expand the scenarios to mix different protocols (Git, SSH, Http).

Feature: Issue 10900
Change-Id: I00927b3b83f45ca852305780f5e67a4272d1ab22

e2e-tests/load-tests/project/Dependencies.scala

diff --git a/e2e-tests/load-tests/project/Dependencies.scala b/e2e-tests/load-tests/project/Dependencies.scala
new file mode 100644
index 0000000..72d2ac2
--- /dev/null
+++ b/e2e-tests/load-tests/project/Dependencies.scala
@@ -0,0 +1,8 @@
+import sbt._
+
+object Dependencies {
+  lazy val gatling = Seq(
+    "io.gatling.highcharts" % "gatling-charts-highcharts",
+    "io.gatling" % "gatling-test-framework",
+  ).map(_ % "3.1.1" % Test)
+}