Update all the readme.md files

[JerryNixon]

Let's relocate the wiki to all the readme.md files for each project. Some of these may not be in the wiki and will just need to be written. Let's include the nuget command, documentation, and sample syntax. We cal also link one readme to another with no problem.

• [ ] Template10.Controls.NavViewEx
• [ ] Template10.Controls.Resizer
• [ ] Template10.Core.Default
• [ ] Template10.Core
• [ ] Template10.Extras
• [ ] Template10.Services.Compression
• [ ] Template10.Services.Dialog
• [ ] Template10.Services.File
• [ ] Template10.Services.Marketplace
• [ ] Template10.Services.Nag
• [ ] Template10.Services.Network
• [ ] Template10.Services.Resources
• [ ] Template10.Services.Secrets
• [ ] Template10.Services.Serialization
• [ ] Template10.Services.Web
• [ ] Template10.Xaml.Behaviors
• [ ] Template10.Xaml.Converters

After this we should be able to delete the wiki.