Ignore directories from the Bazel IntelliJ plugin

These directories contain the generated project files from the Bazel IntelliJ plugin. See these links for info:

https://github.com/bazelbuild/intellij/blob/8c92239f41b20dcf88a22dcb3f44b5a9bdf46a95/.gitignore
https://github.com/bazelbuild/intellij/blob/8c92239f41b20dcf88a22dcb3f44b5a9bdf46a95/base/src/com/google/idea/blaze/base/sync/data/BlazeDataStorage.java#L36

Author: jesseschalken

community/Bazel.gitignore

@@ -4,3 +4,10 @@
 # Ignore all bazel-* symlinks. There is no full list since this can change
 # based on the name of the directory bazel is cloned into.
 /bazel-*
+
+# Directories for the Bazel IntelliJ plugin containing the generated
+# IntelliJ project files and plugin configuration. Seperate directories are
+# for the IntelliJ, Android Studio and CLion versions of the plugin.
+/.ijwb/
+/.aswb/
+/.clwb/