Add README

README.md

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+# Sand Image
+This image format stores a seed and colors for pixel ids in a sand simulation
+# Building
+You need the odin compiler installed on your machine, there are releases if u dont want to install it
+```
+build.sh
+```
+or
+```
+build.bat
+```
+# Usage
+You can convert images to sand images with
+```
+./converter <input image filename> <output image filename>
+```
+You can view sand images with
+```
+./viewer <sand image filename>
+```