Merge branch 'docs/refer-to-gitlab-development-guidelines' into 'master'

Refer to gitlab development guidelines in docs

See merge request !233

HELP

@@ -11,3 +11,6 @@ gdk psql -d gitlabhq_development          # Postgres console
 gdk redis-cli                             # Redis console
 # Development admin account: root / 5iveL!fe
+
+For more information about GitLab development see
+https://docs.gitlab.com/ce/development/README.html.

doc/howto/README.md

@@ -3,6 +3,10 @@
 See the [top level README](../../README.md#getting-started) for GDK
 installation instructions.
+Main purpose of GitLab Development Kit is to make GitLab development easier.
+Please see [https://docs.gitlab.com/ce/development/README.html](https://docs.gitlab.com/ce/development/README.html)
+to learn how to develop GitLab CE.
+
 ## Basic
 - [Browse your development GitLab server](browse.md)