add blog post on how to use typescript (#157)

* add blog post on how to use typescript

* Update 2018-06-06-using-typescript-in-nativescript-vue.md

Author: championswimmer

content/blog/2018-06-06-using-typescript-in-nativescript-vue.md

@@ -0,0 +1,71 @@
+---
+title: Using Typescript in Nativescript-Vue Apps
+authors: [championswimmer]
+toc: true
+intro: Many people love to build Vue apps with TypeScript. You can do that in NativeScript-Vue too.
+---
+
+NativeScript-Vue uses a modified build of vue. The `nativescript-vue` package **is** that build.
+For TypeScript we need type definitions from Vue, so we need to install the original Vue package. 
+
+```shell
+$ npm install --save-dev vue
+```
+
+Once this is done, we have a problem. Anywhere in our code, if we write 
+
+```js
+require('vue')
+```
+
+or
+
+```ts
+import Vue from 'vue'
+```
+
+it will be a huge problem, as we **do not ever** want to _actually_ use the original vue package. 
+We just want to have it here for type definitions and autocomplete. 
+
+Webpack comes to the rescue. We will add this to our webpack config, so that all `vue` imports
+are resolved to `nativescript-vue`:
+
+```js
+alias: { 'vue$': 'nativescript-vue' }
+```
+
+**Use Typescript**
+
+This should set up up with Typescript already. Simply rename .js files to .ts or, if using SFC, then
+
+```vue
+<template>
+  <!-- ... -->
+</template>
+
+<script lang="ts">
+  // typescript code here
+</script>
+```
+
+**Use Class-style components**
+
+You can now install vue-class-components
+
+```shell
+$ npm install --save-dev vue-class-components
+```
+
+And write class-styled component code
+
+```ts
+import {Component} from 'vue-property-decorator'
+
+@Component
+export default class MyComponent extends Vue {
+  count = 1
+  increment () { this.count++ }
+}
+```
+
+That's it! You have TypeScript working in NativeScript-Vue!