Add fsharp layer

contrib/lang/fsharp/README.md

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+# F# contribution layer for Spacemacs
+
+![logo_fsharp](img/fsharp.png)
+
+## Description
+
+This layer adds support for F# language using [fsharpbindng](https://github.com/fsharp/fsharpbinding).
+
+## Packages Included
+
+- [fsharp-mode](https://github.com/fsharp/fsharpbinding) 
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(fsharp))
+```
+
+## Key Bindings
+
+### Compilation
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+<kbd>mcc</kbd>        | Build the project 
+
+### Navigation
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+<kbd>mcd</kbd>        | Go to definition at point
+<kbd>men</kbd>        | Next error
+<kbd>mep</kbd>        | Previous error
+
+### REPL
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+<kbd>mer</kbd>        | Evaluate region
+<kbd>mep</kbd>        | Evaluate phrase
+<kbd>mef</kbd>        | Evaluate buffer
+<kbd>mss</kbd>        | Start REPL
+
+### Helpers (documentation, info)
+
+    Key Binding       |                 Description
+----------------------|------------------------------------------------------------
+<kbd>mst</kbd>        | Show tooltip at point

contrib/lang/fsharp/extensions.el

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+(defvar fsharp-pre-extensions
+  '(
+    ;; pre extension fsharps go here
+    )
+  "List of all extensions to load before the packages.")
+
+(defvar fsharp-post-extensions
+  '(
+    ;; post extension fsharps go here
+    )
+  "List of all extensions to load after the packages.")
+
+;; For each extension, define a function fsharp/init-<extension-fsharp>
+;;
+;; (defun fsharp/init-my-extension ()
+;;   "Initialize my extension"
+;;   )
+;;
+;; Often the body of an initialize function uses `use-package'
+;; For more info on `use-package', see readme:
+;; https://github.com/jwiegley/use-package

contrib/lang/fsharp/packages.el

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+;;; packages.el --- fsharp Layer packages File for Spacemacs
+
+(defvar fsharp-packages '(fsharp-mode))
+(defun fsharp/init-fsharp-mode ()
+  (use-package fsharp-mode
+    :defer t
+    :config
+    (progn
+      (setq fsharp-doc-idle-delay .2)
+      (setq fsharp-build-command "/usr/local/bin/xbuild")
+      ;;;;;;;;; Keybindings ;;;;;;;;;;
+      (evil-leader/set-key-for-mode 'fsharp-mode
+        ;; Compile
+        "mcc" 'compile
+        "mer" 'fsharp-eval-region
+        "mep" 'fsharp-eval-phrase
+        "mef" 'fsharp-load-buffer-file
+        "mst" 'fsharp-ac/show-tooltip-at-point
+        "mgd" 'fsharp-ac/gotodefn-at-point
+        "mss" 'fsharp-show-subshell
+        "mee" 'fsharp-run-executable-file
+        "mfa" 'fsharp-find-alternate-file
+        "men" 'next-error
+        "mep" 'previous-error
+    )
+ )))