Add walkthrough video

Author: zaguiini

README.md

@@ -2,6 +2,8 @@
 
 Run it with `npm install` and `npm run dev-server`.
 
+[Watch the solution walkthrough here](https://www.youtube.com/watch?v=pA_lq7eeGlg)
+
 ## How it works
 
 ### Creating a data type
@@ -11,20 +13,20 @@ Much like the Hackathon, the Editor creates a new post type and define the field
 The "fields" in this prototype are limited to the content areas.
 
 When you select a Group block, a new inspector control ("Content area") is added to the sidebar,
-where you can bind the contents to a specific part of the post object.
+where you can bind the contents to a specific part of the post object:
 
 - `post_content` binds to the `post_content` attribute.
 - Any other value binds to the post meta fields.
 
 ### Entering data
 
-The data type template and displayed in the Editor. User enters content in the group blocks that were added.
+The data type template is displayed in the Editor. User enters content in the content area blocks that were added.
 
-Upon clicking "Save", the back-end will intercept the post, extract the bound Group's contents and
-route them to the appropriate places.
+Upon clicking "Save", the back-end will intercept the post, extract the blocks from the content areas and
+save them to the appropriate places (e.g., `post_content` and post meta fields.)
 
 ### Displaying data
 
 The `post_content` is not intercepted, and the stored content is displayed.
 
-The plugin creates a block variation for each post meta field, and also exposes a block that renders the data type template.
+The plugin creates a block variation for each post meta field, and also exposes a block that renders the data type template from the current Query Loop context.