Add creating-a-sub-command

assets/check-lists/creating-a-sub-command.md

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+## Creating a sub command
+
+- [ ] Create a new function in another file, usually system.rs, power.rs, or thermal.rs
+- [ ] Possibly add unit tests for this new function, especially if parsing
+- [ ] Add a function to print it with `print_{thing}()` as the function name...
+```rs
+fn print_{thing}(raw: bool) {
+    // ...
+}
+```
+- [ ] Add it as a method to either the Getter or Setter trait in interface.rs (Should be very short)
+```rs
+fn speeds(&self, raw: bool) {
+    let speeds = list_cpu_speeds();
+    print_cpu_speeds(speeds, raw);
+}
+```
+- [ ] Add it as an option in structopt in main.rs
+```rs
+/// The speed of the individual cores
+#[structopt(name = "speeds")]
+Speeds {
+    #[structopt(short, long)]
+    raw: bool,
+},
+```
+- [ ] Add a call to the interface from the parse of the structopt like so...
+```rs
+GetType::Speeds { raw } => {
+    int.get.speeds(raw);
+}
+```
+- [ ] Add a match for it in the interactive mode
+```rs
+"get speeds" => int.get.speeds(false),
+```
+- [ ] Add it as a help option in the help function in interactive.rs
+```rs
+pub fn help() {
+    const HELP_TEXT: &str = "\
+    - get
+      - freq
+      - cpus
+      etc.
+    ";
+}
+```