* add bash scripts
* add eng/BuildTask.targets
from dotnet/arcade
* Rename LICENCE->LICENSE.txt; add THIRD-PARTY-NOTICES.txt
* Add MSBuild target that includes the executable delta generator tool
The idea is that projects will be able to include
```
<PackageReference Include="Microsoft.DotNet.HotReload.Utils.Generator.BuildTool" Version="$(MicrosoftDotNetHotReloadUtilsVersion)" />
```
And they will automatically get a task added to their build that will run the included version of the delta generator as part of their build.
* (Generator.BuildTool.targets) run if DeltaScript exists
Seems to generate workable deltas now
* Make a common Generator.Frontend dll for CLI tool and BuildTool
Update READMEs
* (Generator.BuildTool.targets) Check for DeltaScript in project dir
* Remove one redundant subdirectory
* Review feedback
Aleksey Kliger (λgeek)