Add run configuration.

.gitignore

 /.gradle
-/.idea
-!/.idea/runConfigurations.xml
+/.idea/*
+!/.idea/runConfigurations
 /local.properties
 *.iml
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.idea/runConfigurations/TorProbe.xml

+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="TorProbe" type="Application" factoryName="Application">
+    <option name="MAIN_CLASS_NAME" value="org.briarproject.torprobe.TorProbe" />
+    <module name="tor-probe-core" />
+    <option name="PROGRAM_PARAMETERS" value="128.31.0.39 9101" />
+    <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$" />
+    <method />
+  </configuration>
+</component>
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