Complete README with how-to build the docs instructions. (#161)

Author: msaelices

README.md

@@ -3,3 +3,44 @@
 This is the source for the [nativescript-vue.org](https://nativescript-vue.org/) website.
 
 Contributions are welcome, all the content is placed in the `content` directory.
+
+## How to build the documentation
+
+After cloning the repository, do the following steps
+
+``` bash
+cd nativescript-vue.org/
+npm run build:js
+npm run build:css
+npm run build
+```
+
+This sequence is only needed the first time. After that, the only command needed is:
+
+``` bash
+npm run build
+```
+
+## Serve the documentation
+
+Install the `serve` npm package globaly:
+
+``` bash
+npm install -g serve
+```
+
+Run the HTTP server using the already generated `dist/` directory:
+
+``` bash
+serve dist/
+```
+
+Now, you can open the `http://localhost:5000` URL in your browser to see the generated docs.
+
+## How to build in watch mode
+
+In order to detect changes in the `content` directory and rebuild automatically the docs, run the following sentence:
+
+``` bash
+npm run dev
+```