Create Business.StarterIntranet.yml

Added YAML file so that this tool can be pulled into the Office and M365 resource galleries automatically (https://developer.microsoft.com/en-us/office/gallery)

Solutions/Business.StarterIntranet/Business.StarterIntranet.yml

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+page_type: sample
+products:
+  - office-sp
+  - office-365
+languages:
+  - javascript
+  - csharp
+  - nodejs
+  - typescript
+extensions:
+  contentType: tools
+  technologies:
+    - Add-ins
+  createdDate: '1/1/2016 12:00:00 AM'
+  scenarios:
+    - Embed
+title: PnP Starter Intranet for Office 365/SharePoint Online (Business.O365StarterIntranet)
+description: Intranet projects shouldnΓÇÖt have to reinvent the wheel every time for basic features (like navigation or multilingualism). This solution aims to provide the fundamental building blocks of a common intranet solution with SharePoint Online/Office 365 through a lightweight client side solution using the latest web stack development tools and frameworks.