just-js: add page (#8674)

pages/linux/just-js.md

@@ -0,0 +1,24 @@
+# just
+
+> A V8 JavaScript runtime for Linux.
+> More information: <https://github.com/just-js/just>.
+
+- Start a REPL (interactive shell):
+
+`just`
+
+- Run a JavaScript file:
+
+`just {{path/to/file.js}}`
+
+- Evaluate JavaScript code by passing it as an argument:
+
+`just eval "{{code}}"`
+
+- Initialize a new project in a directory of the same name:
+
+`just init {{project_name}}`
+
+- Build a JavaScript application into an executable:
+
+`just build {{path/to/file.js}} --static`