Add languages/ruby

languages/ruby/Setup.hs

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+import Distribution.Simple
+main = defaultMain

languages/ruby/ruby.cabal

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+name:                ruby
+version:             0.1.0
+synopsis:            tree-sitter ruby language bindings
+description:         Please see README.md
+homepage:            https://github.com/github/semantic-diff#readme
+author:              semantic-code
+maintainer:          tclem@github.com
+copyright:           2017 GitHub
+category:            Web
+build-type:          Simple
+-- extra-source-files:
+cabal-version:       >=1.10
+
+library
+  hs-source-dirs:      src
+  exposed-modules:     Text.Parser.TreeSitter.Ruby
+  build-depends:       base >= 4.7 && < 5
+                     , haskell-tree-sitter
+  default-language:    Haskell2010
+  c-sources:           vendor/tree-sitter-ruby/src/parser.c
+
+source-repository head
+  type:     git
+  location: https://github.com/github/semantic-diff

languages/ruby/src/Text/Parser/TreeSitter/Ruby.hs

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+module Text.Parser.TreeSitter.Ruby where
+
+import Text.Parser.TreeSitter
+import Foreign.Ptr
+
+foreign import ccall "vendor/tree-sitter-ruby/src/parser.c ts_language_ruby" ts_language_ruby :: Ptr Language

languages/ruby/vendor/tree-sitter-ruby

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+Subproject commit 95e3f84750fb6e8943d97518d5b9fa9cbdb4aa8b