feat: start on install section

pkgfile/src/lib.rs

@@ -8,6 +8,10 @@ impl PKGFile {
     pub fn new(manifest: String, data: Vec<u8>) -> PKGFile {
         PKGFile { manifest, data }
     }
+
+    pub fn has_data(&self) -> bool {
+        !self.data.is_empty()
+    }
 }
 
 impl Default for PKGFile {