Block out config loading

src/main.rs

···
+fn help() {
+    println!("tangled-on-commit")
+}
+
+#[derive(Debug)]
+struct Config {
+    handle: String, 
+    repo_name: String,
+    shell: String,
+}
+
+fn load_config() -> Result<Config, ()> {
+    // load config from cli args if present
+    // if omitted, fallback to a local `tangled-on-commit.json` file
+    // if key omitted or file not found, fall back to env
+    // if env omitted, error out and quit
+
+    return Ok(Config {
+        handle: String::from(""),
+        repo_name: String::from(""),
+        shell: String::from("")
+    });
+}
+
 fn main() -> Result<(), i32> {
+
     // load configuration
+    let config = match load_config() {
+        Ok(res) => res,
+        Err(_) => {
+            // q
+            return Err(1)
+        }
+    };
+    
+    help();
+    println!("{:#?}", config);
 
     // resolve handle to did
     // resolve did+repoName to knotserver