feat: added command functionality to install

pkgfile/src/lib.rs

@@ -1,8 +1,24 @@
+#[derive(Debug)]
 pub struct PKGFile {
     pub manifest: String,
     pub data: Vec<u8>,
 }
 
+impl PKGFile {
+    pub fn new(manifest: String, data: Vec<u8>) -> PKGFile {
+        PKGFile { manifest, data }
+    }
+}
+
+impl Default for PKGFile {
+    fn default() -> PKGFile {
+        PKGFile {
+            manifest: String::new(),
+            data: Vec::new(),
+        }
+    }
+}
+
 impl TryFrom<Vec<u8>> for PKGFile {
     type Error = ();