Updated the README with a more clear example of what the purpose of gman is, and also support fully isolated, multiple local based configurations with isolated git repositories so users can have separate repos for different environments

src/config.rs

@@ -218,8 +218,8 @@ impl Config {
     ///
     /// ```no_run
     /// # use gman::config::Config;
-    /// let provider_config = Config::default().extract_provider_config(None);
-    /// println!("using provider config: {}", provider_config.unwrap().name);
+    /// let provider_config = Config::default().extract_provider_config(None).unwrap();
+    /// println!("using provider config: {:?}", provider_config.name);
     /// ```
     pub fn extract_provider_config(&self, provider_name: Option<String>) -> Result<ProviderConfig> {
         let name = provider_name