third_party: goimports: apply import grouping patch

This allows developers to build //:goimports and point their IDE/editor
to it to easily conform to the import style guide.

We also document how to run this tool in CODING_STANDARDS.md.
Integration with IntelliJ is TBD.

Change-Id: I61e412162e51e513ec5888eda5221c9d145b6454
Reviewed-on: https://review.monogon.dev/c/monogon/+/493
Reviewed-by: Leopold Schabel <leo@nexantic.com>
diff --git a/CODING_STANDARDS.md b/CODING_STANDARDS.md
index 2ef7e64..fce6edd 100644
--- a/CODING_STANDARDS.md
+++ b/CODING_STANDARDS.md
@@ -43,3 +43,9 @@
     foo "dev.source.monogon/other/subtree/c"
 )
 ```
+
+A styleguide compliant fork of `goimports` (itself a superset of `gofmt`)  can be built by running:
+
+    $ bazel build //:goimports
+
+The resulting binary can then be copied to anywhere in the filesystem (eg. $HOME/bin/goimports-monogon) and any editor which supports gofmt/goimports integration can be pointed at this tool to automatically reformat files to the required format.