Add scaffolding for problems

src/main.rs

@@ -1 +1,33 @@
-fn main() {}
+use clap::{Parser, Subcommand};
+use enum_dispatch::enum_dispatch;
+
+mod one;
+
+#[derive(Parser)]
+struct GlobalArgs {}
+
+#[derive(Parser)]
+struct Args {
+    #[clap(subcommand)]
+    problem: Problems,
+    #[clap(flatten)]
+    global: GlobalArgs,
+}
+
+#[enum_dispatch]
+trait Problem {
+    fn solve(self, args: GlobalArgs) -> color_eyre::Result<()>;
+}
+
+#[derive(Subcommand)]
+#[enum_dispatch(Problem)]
+enum Problems {
+    #[clap(name = "1")]
+    One(one::Args),
+}
+
+fn main() -> color_eyre::Result<()> {
+    color_eyre::install()?;
+    let args = Args::parse();
+    args.problem.solve(args.global)
+}

src/one.rs

@@ -0,0 +1,10 @@
+use crate::{GlobalArgs, Problem};
+
+#[derive(clap::Parser)]
+pub struct Args {}
+
+impl Problem for Args {
+    fn solve(self, _: GlobalArgs) -> color_eyre::Result<()> {
+        todo!()
+    }
+}