initial pass at a golang mode

contrib/lang/go/README.md

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+# go contribution layer for Spacemacs
+
+![go](img/go.png)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [go contribution layer for Spacemacs](#go-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+        - [Layer](#layer)
+    - [Working with Go](#working-with-go)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This layers adds extensive support for go.
+
+Features:
+- gofmt on file save
+
+## Install
+
+### Layer
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(go)
+  "List of contribution to load."
+)
+```
+
+## Working with Go
+
+Go commands (start with `m`):
+
+    Key Binding            |                 Description
+---------------------------|------------------------------------------------------------
+<kbd>SPC m d p</kbd>       | godoc at point
+<kbd>SPC m i g</kbd>       | goto imports
+<kbd>SPC m i a</kbd>       | add import
+<kbd>SPC m i r</kbd>       | remove unused import
+<kbd>SPC m p b</kbd>       | go-play buffer
+<kbd>SPC m p r</kbd>       | go-play region
+<kbd>SPC m p d</kbd>       | download go-play snippet

contrib/lang/go/packages.el

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+(defvar go-packages
+  '(
+    go-mode
+    )
+  "List of all packages to install and/or initialize. Built-in packages
+which require an initialization must be listed explicitly in the list.")
+
+(defun go/init-go-mode()
+  (use-package go-mode
+    :defer t
+    :init
+    (progn
+      (evil-leader/set-key
+        "mdp"  'godoc-at-point
+        "mig"  'go-goto-imports
+        "mia"  'go-import-add
+        "mir"  'go-remove-unused-imports
+        "mpb"  'go-play-buffer
+        "mpr"  'go-play-region
+        "mpd"  'go-download-play
+      )
+    )
+    :config
+    (add-hook 'before-save-hook 'gofmt-before-save)
+    )
+  )
+