Add TypeScript configuration layer

contrib/lang/typescript/README.md

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+# TypeScript contribution layer for Spacemacs
+
+![logo](img/TypeScript.png)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [TypeScript contribution layer for Spacemacs](#typescript-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+        - [Prerequisites](#prerequisites)
+    - [Key bindings](#key-bindings)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This adds support for TypeScript editing via [typescript-tools](https://github.com/clausreinke/typescript-tools) and [emacs-tss](https://github.com/aki2o/emacs-tss).
+
+These provide:
+- syntax coloring
+- error highlighting
+- autocompletion
+- jump-to-definition
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(typescript))
+```
+
+### Prerequisites
+
+You'll need [typescript-tools](https://github.com/clausreinke/typescript-tools) and fairly obviously also the TypeScript compiler:
+
+```
+$ npm install typescript
+$ git clone git://github.com/clausreinke/typescript-tools.git
+$ cd typescript-tools/
+$ npm install -g
+```
+
+## Key bindings
+
+Key Binding   | Description
+--------------|------------------------------------------------------------
+`<SPC> m h`   | Show popup help (with type info)
+`<SPC> m d`   | Jump to definition
+`<SPC> m c f` | Flymake check (is done automatically on save)

contrib/lang/typescript/packages.el

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+;;; packages.el --- typescript Layer packages File for Spacemacs
+;;
+;; Copyright (c) 2012-2014 Sylvain Benner
+;; Copyright (c) 2014-2015 Chris Bowdon & Contributors
+;;
+;; Author: Chris Bowdon <c.bowdon@bath.edu>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(defvar typescript-packages '(tss)
+  "List of all packages to install and/or initialize. Built-in packages
+which require an initialization must be listed explicitly in the list.")
+
+(defvar typescript-excluded-packages '()
+  "List of packages to exclude.")
+
+(defun typescript/init-tss ()
+  "Initialize my package"
+  (use-package tss
+    :mode ("\\.ts\\'" . typescript-mode)
+    :defer t
+    :init
+    (progn
+      (require 'typescript)
+      (require 'tss)
+      (evil-leader/set-key-for-mode 'typescript-mode
+        "mh" 'tss-popup-help
+        "md" 'tss-jump-to-definition
+        "mcf" 'tss-run-flymake))
+    :config
+    (progn
+      (tss-config-default))))