* add basic tutorial, re-export client stuff in HighLevel.Generated
* add a relative link in README.md
* forgot to document the language extensions
* cabal file fixup
* more context to compile-proto-file
* haskell syntax highlighting in markdown
* link to gRPC official tutorials for basic concepts
* add a note on how to build the examples
* prominent notice of required gRPC version
* fix typo
* do some error handling, show how to run the example executables
* use mapM
