Adds .ide ignore rules and run configurations.

Android/.idea/.gitignore

@@ -1,3 +1,18 @@
-# Default ignored files
-/shelf/
+# User-specific and local IDE state files
 /workspace.xml
+/shelf/
+/caches/
+/deviceManager.xml
+/deploymentTargetSelector.xml
+/appInsightsSettings.xml
+/planningMode.xml
+/studiobot.xml
+/markdown.xml
+/assetWizardSettings.xml
+/usage.statistics.xml
+/tasks.xml
+
+# IntelliJ module files generated by Gradle
+*.iml
+*.iws
+/modules.xml