chore: initialize workspace and main project with standard structure

.gitignore

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+01.workspace/target

01.workspace/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "heave"
+version = "0.1.0"

01.workspace/Cargo.toml

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+[workspace]
+members = ["heave" ]
+resolver = "3"  # optional, to specify dependency resolver version
+

01.workspace/heave/Cargo.toml

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+[package]
+name = "heave"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

01.workspace/heave/src/lib.rs

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+use std::*;
+
+mod fun;
+mod imp;
+mod mcr;
+mod str;
+mod trt;
+mod tst;