scheme: add page (#2511)

pages/common/scheme.md

@@ -0,0 +1,23 @@
+# scheme
+
+> MIT Scheme language interperter and REPL (interactive shell).
+
+- Open an interactive shell (REPL):
+
+`scheme`
+
+- Run a scheme program (with no REPL output):
+
+`scheme --quiet < {{script.scm}}`
+
+- Load a scheme program into the REPL:
+
+`scheme --load {{script.scm}}`
+
+- Load scheme expressions into the REPL:
+
+`scheme --eval {{"(define foo 'x)"}}`
+
+- Open the REPL in quiet mode:
+
+`scheme --quiet`