Start work on a nimbers library.

diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+/target

diff --git a/Cargo.lock b/Cargo.lock
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+++ b/Cargo.lock
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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "nimber-rs"
+version = "0.1.0"

diff --git a/Cargo.toml b/Cargo.toml
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+[package]
+name = "nimber-rs"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

diff --git a/src/finitenimber.rs b/src/finitenimber.rs
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+++ b/src/finitenimber.rs
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+pub trait FiniteNimberBaseInteger : std::ops::BitXor + Sized {
+    type Owned;
+}
+
+pub struct FiniteNimber<T: FiniteNimberBaseInteger> {
+    n: T,
+}

diff --git a/src/lib.rs b/src/lib.rs
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+mod finitenimber;
+
+pub use finitenimber::FiniteNimber;