Mention how to get imports right in IDEA or Goland. (#1242)

Signed-off-by: Marcin Owsiany <marcin@owsiany.pl>
Co-Authored-By: Aleksey Dukhovniy <adukhovniy@mesosphere.io>

STYLEGUIDE.md

@@ -57,6 +57,15 @@ Executing `make lint` uses `goimports` which is configured to ensure this struct
 
 `make imports` is also a useful tool in order to help create this structure.  If all imports are in 1 import block (no lines of separation), `make imports` will modify the file in the appropriate order and structure.
 
+If you use Goland or Intellij IDEA, setting the following under "Editor > Code Style > Go" in the "Imports" tab will match the above requirements:
+```
+[x] Add parentheses for a single import
+Sorting type [gofmt]
+[x] Group stdlib imports
+   [x] Move all stdlib imports in a single group
+[x] Group current project imports
+[x] Move all import in a single declaration
+```
 
 ### Naming