chore: initialize empty workspace structure with empty lib project with deps

01.workspace/oxydice_lib/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "oxydice_lib"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rand = "0.9.2"

01.workspace/oxydice_lib/src/lib.rs

@@ -0,0 +1,8 @@
+use std::*;
+
+mod fun;
+mod imp;
+mod mcr;
+mod str;
+mod trt;
+mod tst;