✨ feat(config): add cli config

- introduce cli config with clap
  - add subcommand rules and label

src/config_cli.rs

@@ -0,0 +1,32 @@
+use clap::{Parser, Subcommand};
+
+mod label_cli;
+mod rules_cli;
+
+use cull_gmail::{Config, Result};
+use label_cli::LabelCli;
+use rules_cli::RulesCli;
+
+#[derive(Subcommand, Debug)]
+enum Commands {
+    /// Configure end-of-life rules
+    #[clap(name = "rules")]
+    Rules(RulesCli),
+    /// Add ore remove Label from rule
+    #[clap(name = "label")]
+    Label(LabelCli),
+}
+
+#[derive(Parser, Debug)]
+pub struct ConfigCli {
+    #[clap(flatten)]
+    logging: clap_verbosity_flag::Verbosity,
+    #[command(subcommand)]
+    command: Option<Commands>,
+}
+
+impl ConfigCli {
+    pub fn run(&self, _config: Config) -> Result<()> {
+        Ok(())
+    }
+}