[Request] [language/lang-code] APL

APL (named after the book A Programming Language) is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. It uses a large range of special graphic symbols to represent most functions and operators, leading to very concise code. It has been an important influence on the development of concept modeling, spreadsheets, functional programming, and computer math packages. It has also inspired several other programming languages.

See "Game of Life" program example in APL:
```apl
life←{↑1 ⍵∨.∧3 4=+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵}
```

- [Introduction to APL](http://www.softwarepreservation.org/projects/apl/Books/AnIntroductionToAPL)
- [Try APL online](https://tryapl.org/)

Start by reviewing existing language documentation in the repository to learn the expected structure and level of detail. Use the APL introduction, online interpreter, and Game of Life example from the issue as references; done means adding a complete APL page that follows the repository’s conventions and includes accurate, runnable examples.

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