add reasonml syntax

[Khady]

Initiating support for #4

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[Khady]

@cla-bot check

[cla-bot]

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[notpeter]

You'll need to add language folders for reason_ml and reason_ml_interface including config.toml to associate file extensions with the grammars. Then you'll also want to include the relevant tree-sitter queries (*.scm) as well.

Look at the other languages/ folders for examples.

And Developing Zed Language Extensions in the docs for more.

[Khady]

Getting an error in zed's log when trying to install the extension with the additional reason grammar. But it's not obvious what is zed running to compile the grammar.

Caused by:
    failed to compile reasonml parser with clang: wasm-ld: warning: creating shared libraries, with -shared, is not yet stable
    wasm-ld: error: symbol exported via --export not found: tree_sitter_reasonml
    clang: error: linker command failed with exit code 1 (use -v to see invocation)