If you are associated with a programming language (for example: through endorsement or being an internal contributor) you will not be able to add it unless you can prove its notability by citing multiple external sources that were not created with a conflict of interest.
The name of the file will be displayed as-is in the readme. It should be named according to the language it was written in. The name shouldn't be abbreviated too far (use `JavaScript.js` instead of `JS.js`) and it shouldn't be abbreviated too little (use `CSS.css` instead of `Cascading Style Sheets.css`). Additionally, use spaces instead of hyphens or underscores (use `Objective C.m` instead of `Objective-C.m`).
The code in the file should be the simplest and most straightforward way to print/display/show `Hello World` exactly once in the language used. User input should not be requested and a newline should only be printed when necessary.
