Some readme elaboration, but mostly cons

src/stl.rs

@@ -31,13 +31,13 @@ pub mod strings;
 /// any kind of further configuration data into a symtable
 pub fn static_stdlib(syms: &mut SymTable) -> Result<(), String> {
     syms.insert(
-        "append".to_string(),
+        "cons".to_string(),
         Symbol {
-            name: String::from("append"),
+            name: String::from("cons"),
             args: Args::Infinite,
             conditional_branches: false,
-            docs: append::APPEND_DOCSTRING.to_string(),
-            value: ValueType::Internal(Rc::new(append::append_callback)),
+            docs: append::CONS_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(append::cons_callback)),
         },
     );