## Description
This PR adds configuration files for `cspell`, which is available as a recommended VS Code plugin for this repo. This PR also fixes most "non-breaking" typos (comments, error messages, local names) for code files within the repo.
This PR **does not** add any kind of spell-checking enforcement on the repo.
### Type of Change
N/A
### Why
Clear up misunderstandings in comments / error messages.
### What
What changes were made to the codebase to solve the bug, add the functionality, etc. that you specified above.
## Screenshots
N/A
## Testing
N/A
* Added Mso library required for ReactHost
* Change files
* Changed pch.h yo use angle brackets.
* Renamed README files
* Reduce size of generated code by trimming the pch.h file.
* Reduced size of PCH files by CppWinRTRootNamespaceAutoMerge flag
Jon Thysell
Vladimir Morozov
Agne Lukoseviciute
Vladimir Morozov