better help

src/main.rs

@@ -14,11 +14,27 @@ struct Arg {
 //    #[command(subcommand)]
 //    command: Option<Commands>,
 
-    /// Show verbose output
-    #[arg(short, long)]
-    verbose: bool,
-
-    /// An expression that should be used to calculate something
+    ///Syntax: '1 + task_param(inner) + 1 '{n}
+    ///{n}
+    ///Specify an expression, any expression may contain child expressions, which can be denoted{n}
+    ///with parenthesis '(child)'. Expressions may have a task applied to them, such as a
+    ///logarithm{n} or drawing a root. To apply a task to a expression, simply write the name of{n}
+    ///the task before denoting an expression: 'myTask(myExpression)'. You can apply a parameter{n}
+    ///to some tasks by using an underscore '_': 'myTask_myParameter(myExpression)'.{n}
+    ///{n}
+    ///List of Tasks:{n}
+    ///{n}
+    ///"none"                           explicitly set no task for expression{n}
+    ///                                 parameter: none 
+    ///{n}
+    ///"root" or "sqrt"                 draw the root of the expression{n}
+    ///                                 parameter: draw n'th root of expression, default is 2.0{n}
+    ///{n}
+    ///"power" or "pow" or "sq"         apply an exponent to the expression{n}
+    ///                                 parameter: specify exponent n, default is 2.0{n}
+    ///{n}
+    ///"log" or "ln"                    apply a logarithm to the expression{n}
+    ///                                 parameter: specify base n, default is 10{n}
     expressions: Vec<String>,
 }