feat: add help command

src/builtins/help.rs

@@ -0,0 +1,27 @@
+use crate::error::ShellError;
+use crate::builtins::{Builtin, BuiltinConfig};
+
+
+pub struct Help;
+
+impl Builtin for Help {
+
+    fn execute(&mut self, _: &mut BuiltinConfig, _: Vec<String>) -> Result<(), ShellError> {
+        let commands =
+           "cd              changes current working directory
+            change-prompt   changes prompt style (default, bashlike, simpledirectory)
+            exit            exits the shell
+            fetch           prints out system information
+            help            displays this command
+            ls              lists contents of directory
+            open            shows content of files
+            pwd             shows path to current working directory
+            segfault        exit but through segfault
+            sus             shows amogus";
+
+        for line in commands.lines(){
+            println!("{}",line.trim_start());
+        }
+        Ok(())
+    }
+}

src/builtins/mod.rs

@@ -6,6 +6,7 @@ mod cd;
 mod change_prompt;
 mod exit;
 mod fetch;
+mod help;
 mod ls;
 mod open;
 mod pwd;
@@ -39,6 +40,7 @@ const BUILTINS: Lazy<Vec<(&str, Box<dyn Builtin>)>> = Lazy::new(|| {
         ("pwd", Box::new(pwd::Pwd)),
         ("segfault", Box::new(segfault::Segfault)),
         ("sus", Box::new(sus::Sus)),
+        ("help", Box::new(help::Help)),
     ]
 });