Add doc comments

red/src/gamepad.rs

@@ -1,3 +1,4 @@
+/// Functionality for retrieving and interpreting gamepad input
 use gilrs::Axis::*;
 use gilrs::EventType::*;
 use gilrs::Gilrs;

red/src/printer/gcode/g0.rs

@@ -1,5 +1,6 @@
 use super::*;
 
+/// Linear Move
 #[derive(Debug)]
 pub struct G0Command {
     pub x: Option<f64>,

red/src/printer/gcode/g28.rs

@@ -1,5 +1,6 @@
 use super::*;
 
+/// Auto Home
 #[derive(Debug)]
 pub struct G28Command {
     home_x: bool,

red/src/printer/gcode/m114.rs

@@ -2,6 +2,7 @@ use super::*;
 use lazy_static::lazy_static;
 use regex::Regex;
 
+/// Get Current Position
 #[derive(Debug, Default)]
 pub struct M114Command;
 

red/src/printer/gcode/mod.rs

@@ -1,3 +1,14 @@
+/// Structs that implement `GcodeCommand` such that for a command
+/// - it is known how to invoke it through `GcodeCommand::command()`
+/// - and the meaning of the reply can be parsed with `GcodeCommand::parse_reply(reply)`
+///
+/// The intended use is though the `Printer::send_gcode()` function.
+/// Example:
+/// ```rust
+/// let mut printer = Printer::connect(DEFAULT_TTY).await.unwrap();
+/// let command = Box::new(G0Command::new(true, true, true));
+/// let reply: GcodeReply = printer.send_gcode(command).await.unwrap();
+/// ```
 mod g0;
 mod g28;
 mod m114;