first draft of the README file

changed file extensions of bookmark and config file

src/config.rs

@@ -60,7 +60,7 @@ pub struct StyleSettings {
     #[default_value("default")]
     pub stack_path_style: String,
     #[style_config]
-    #[default_value("green")]
+    #[default_value("magenta")]
     pub stack_punct_style: String,
     #[style_config]
     #[default_value("default")]
@@ -72,12 +72,12 @@ pub struct StyleSettings {
     #[default_value("default")]
     pub bookmarks_path_style: String,
     #[style_config]
-    #[default_value("green")]
+    #[default_value("magenta")]
     pub bookmarks_punct_style: String,
 }
 
 impl Config {
-    const CONFIG_FILE_NAME: &str = "navigate.conf";
+    const CONFIG_FILE_NAME: &str = "navigate.toml";
 
     /// generates and populates a new instance of Config
     pub fn new(styles_as_ansi_sequences: bool) -> Result<Self> {