Update README.md

Author: sneakyevil

README.md

@@ -1,9 +1,18 @@
 # Model Exporter
 This is primitve model exporter that takes `.perm.bin` file and export models & materials to `.obj` & `.mtl` files.
 
-# Args
+## Args
 `-perm`: Path to `.perm.bin` file.
 
 `-outdir`: Path to directory where it output the files.
 
 `-silent`: Disable wait for key when finished. (Useful for batch exporting)
+
+## Usage
+Simple launch the executable and select perm file or use launch args.
+
+This tool doesn't export textures, but does export materials and textures are pointing to parent directory under `Textures` ie. `../Textures/<Hash>.png`.
+
+You need to export the textures yourself. Here is one tool: https://github.com/sneakyevil/SleepingDogs-UltimateTexTool after loading textures in that tool you need to use `Texture > Rename to Hashes`.
+
+After you got the textures with the hashed names you just place them in that parent directory: `Textures` and while loading the model it will load the textures.