Add Jenkins pipeline for CI/CD validation with Gerrit-CI

Change-Id: I956a2b2c513eea9ca5a1c24ed4e5260278d3faad

Jenkinsfile

diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..84c2561
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,2 @@
+pluginPipeline(formatCheckId: 'gerritforge:plugins-events-eiffel-code-style',
+                buildCheckId: 'gerritforge:plugins-events-eiffel-build-test')