Add serde feature and dependency for (de)serialization

Cargo.toml

@@ -5,5 +5,9 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+serde = ["dep:serde"]
+
 [dependencies]
+serde = { version = "1.0.197", features = ["derive"], optional = true }
 zip = "0.6.6"

src/virtual_fs.rs

@@ -11,6 +11,7 @@ use zip::ZipWriter;
 
 /// Folder representation in virtual file system
 #[derive(Debug, Default, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct VFolder {
     folders: HashMap<String, VFolder>,
     files: HashMap<String, VFile>,
@@ -188,6 +189,7 @@ impl VFolder {
 
 /// File representation in virtual file system
 #[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum VFile {
     /// Text file
     Text(String),