Add author builtin

src/main.zig

@@ -213,11 +213,26 @@ fn cdFn(shell_state: *ShellState, command: [][]const u8, allocator: Allocator) !
     }
 }
 
+fn authorFn(shell_state: *ShellState, command: [][]const u8, allocator: Allocator) !void {
+    _ = shell_state;
+    _ = command;
+    _ = allocator;
+    print(
+        \\Author: Robby
+        \\Description: A shell to promote math!
+        \\Ask for the source code!
+        \\
+        \\Derived from an earlier version written in C by Spencer.
+        \\
+    , .{});
+}
+
 fn execCommand(command: [][]const u8, shell_state: *ShellState, allocator: Allocator) !u8 {
     const builtins = comptime .{
         .{ "exit", exitFn },
         .{ "nomorenumbers", nomorenumbersFn },
         .{ "cd", cdFn },
+        .{ "author", authorFn },
     };
     const builtinMap = StaticStringMap(BuiltinFunc).initComptime(builtins);