Ignore Java settings files in gerrit-plugin-api

These settings are created by m2eclipse but don't matter on
this module because there are no Java source files here.

Change-Id: I3c21c40ad5200c320ecb4189aef3618d10333855

gerrit-plugin-api/.gitignore

diff --git a/gerrit-plugin-api/.gitignore b/gerrit-plugin-api/.gitignore
index 96d61a1..574d1fc 100644
--- a/gerrit-plugin-api/.gitignore
+++ b/gerrit-plugin-api/.gitignore
@@ -3,4 +3,6 @@
 /.project
 /.settings/org.maven.ide.eclipse.prefs
 /.settings/org.eclipse.m2e.core.prefs
+/.settings/org.eclipse.core.resources.prefs
+/.settings/org.eclipse.jdt.core.prefs
 /gerrit-pluginapi-ssh.iml