create skeleton for server from design

server/texture-sync-server/src/persistency/image_convert/mod.rs

@@ -0,0 +1,19 @@
+// TODO: remove on implementation
+#![allow(unused_imports)]
+#![allow(unused_variables)]
+#![allow(dead_code)]
+
+
+use crate::model::*;
+
+pub struct ConvertConfig {
+    pub desired_size: (usize, usize),
+}
+
+pub fn generate_preview(
+    input: &[u8],
+    format: TextureFormat,
+    config: &ConvertConfig,
+) -> ::image::ImageResult<Vec<u8>> {
+    unimplemented!()
+}