create skeleton for server from design

server/texture-sync-server/src/model/mod.rs

@@ -0,0 +1,20 @@
+// TODO: remove on implementation
+#![allow(unused_imports)]
+#![allow(unused_variables)]
+#![allow(dead_code)]
+
+pub struct Sha256(pub [u8; 64]);
+
+pub struct Texture {
+    pub id: String,
+    pub name: String,
+    pub tags: Vec<String>,
+    pub format: TextureFormat,
+    pub resolution: (usize, usize),
+    pub texture_hash: Sha256,
+}
+
+pub enum TextureFormat {
+    PNG,
+    JPEG,
+}