☂️ Initial bringup

[varungandhi-src]

• [x] Replace name Hyperpolyglot -> Langur everywhere https://github.com/sourcegraph/langur/pull/4
• [x] Update to latest Linguist version https://github.com/sourcegraph/langur/pull/7
• [x] Turn on Clippy https://github.com/sourcegraph/langur/pull/10
• [ ] Overhaul README
• [ ] Add development docs
  • How to build a binary and run it
  • How to run tests
  • How to update Linguist version
• [ ] https://github.com/sourcegraph/langur/issues/5
• [ ] Add Go bindings
  • [ ] Add benchmarks against Enry
  • [ ] Add easy result comparison against Enry