Add 'Hoogle' to the glossary

Author: mpilgrem

doc/glossary.md

@@ -27,6 +27,7 @@ The following terms are used in Stack's documentation.
 |'Haskell' extension|The ['Haskell' extension]() for VS Code.                  |
 |HLS                |[Haskell Language Server](https://haskell-language-server.readthedocs.io/en/latest/), an implementation of the Language Server Protocol for Haskell.|
 |Homebrew           |A [package manager](https://brew.sh/) for macOS or Linux, or its executable `brew`.|
+|Hoogle             |A Haskell API [search engine](https://hoogle.haskell.org/).|
 |Hpack              |A [format](https://github.com/sol/hpack) for Haskell packages or the executable `hpack` that produces a Cabal file from `package.yaml`.|
 |Linux              |A family of operating systems based on the Linux kernal.  |
 |macOS              |The primary operating system for Apple's Mac computers. Previously known as Mac OS X or OS X.|