Text file configuration provider implementation for Microsoft.Extensions.Configuration.
Only make for my learning and understanding about Configuration in dotnet core.
Dummy file configuration, one key/value per line.
The default key/value separator is ':' but it can be overrided on AddTextFileConfiguration
call.
...
SomeKey:SomeValue
SomeOtherKey:SomeOtherValue
...
...
SomeKey#SomeValue
SomeOtherKey#SomeOtherValue
...