Include Documentation markdown in releases

The release build process currently doesn't build the new documentation folder into the release.

Also, the Documentation folders and all markdown files will need Unity .meta files.

Create a Unity Project with Malimbe as an asset, Unity will create the .meta files for commit.

Also, update the package.json in Malimbe to include the Documentation directory

https://github.com/ExtendRealityLtd/Malimbe/blob/9cf1ed090fc33ef1e64de3ade406b1f1f21942c1/package.json#L25-L33

```
"files": [
"*.md",
"*.meta",
"Editor",
"Runtime",
"Documentation"
],
```

Does `"Documentation"` need to look back in the parent directory? `"../Documentation"`?