feat: Implemented file hierarchy initialization

- Bump version to 0.5.1
- Added Config::save method
- cli: Added init command

src/config/mod.rs

@@ -1,12 +1,12 @@
 //! Configuration file that handles (de-)serializing other components
 
-use std::{fs::{self, DirEntry},path::{Path, PathBuf}};
-use serde::Deserialize;
+use std::{fs::{self, DirEntry}, io::Write, path::{Path, PathBuf}};
+use serde::{Deserialize, Serialize};
 
 use crate::{SquadObject, account::Account, error::Error, quest::Quest};
 
 /// Struct for containing paths to other (de-)serializable things
-#[derive(Deserialize)]
+#[derive(Serialize, Deserialize)]
 #[serde(default)]
 pub struct Config {
     /// Path to config directory
@@ -112,6 +112,42 @@ impl Config {
         }
     }
     
+    /// Serialize config into TOML.
+    /// Config will be saved as `path/config.toml`
+    ///
+    /// # Examples
+    /// ```rust
+    /// use squad_quest::config::Config;
+    ///
+    /// let path = "cfg".into();
+    ///
+    /// let config = Config::default();
+    ///
+    /// if let Err(error) = config.save(path) {
+    ///     // handle error
+    /// }
+    /// ```
+    pub fn save(&self, path: PathBuf) -> Result<(), Error> {
+        let mut path = path;
+        path.push("config.toml");
+        
+        let str = match toml::to_string_pretty(&self) {
+            Ok(string) => string,
+            Err(error) => return Err(Error::TomlSerializeError(error)),
+        };
+
+        let mut file = match fs::File::create(path) {
+            Ok(f) => f,
+            Err(error) => return Err(Error::IoError(error)),
+        };
+
+        if let Err(error) = file.write_all(str.as_bytes()) {
+            return Err(Error::IoError(error));
+        }
+
+        Ok(())
+    }
+
     /// Deserialize config from TOML
     /// 
     /// # Examples