Add alpha post and fix generation script (#30)

* Fix generation script and update readme
* Add first alpha prototype post

Author: edwardhorsford

README.md

@@ -30,6 +30,17 @@ You have two choices for adding a post:
 4. If you have images, add them to a folder in `app/images/[service-name]/YYYY/MM/[post-name]/`
 5. Make a PR with your changes and get it reviewed
 
+### Add a post using the generation scripts
+
+[View more details on the scripts here.](https://x-govuk.github.io/govuk-design-history/generate-a-page-of-screenshots/)
+
+1. Use a PNG optimiser [like TinyPNG](https://tinypng.com/) to reduce the file size of your images.
+2. Create a folder for your images and them in `app/images/[service-name]/YYYY/MM/[post-name]/`
+3. From the terminal, run `node scripts/generate.js [path]` where `path` is the full path to the folder of images. The easiest way to do this is to type `node scripts/generate.js ` and then drag the folder from Finder on to your terminal to fill in the path.
+4. The script will generate a post linking to each image.
+5. You should check the title text for each image and ammend as needed.
+6. The script will prepend the post filename with the current date but you can delete this if you like.
+
 ## Deploying and publishing
 
 Once you have a post you want to publish, make a PR on this repo with your suggested change.