Add java program to create test data

testdata/create.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# use the correct working directory
+cd $(dirname "$0")
+
+# compile java code
+mkdir -p bin
+javac -sourcepath src -d bin src/creation/Creator.java
+
+# recreate output dir
+rm -rf outputdir
+mkdir -p outputdir/data/textures
+
+# create textures
+java -classpath bin creation.Creator
+
+# place a server binary in the output directory
+(
+  cd ../server/texture-sync-server
+  cargo build --release
+)
+cp ../server/texture-sync-server/target/release/texture-sync-server ./outputdir/