move ratio to own crate (again)

ratio_ops/.gitignore

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+/target

ratio_ops/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ratio_ops"
+version = "0.1.0"

ratio_ops/Cargo.toml

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+[package]
+name = "ratio_ops"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

ratio_ops/src/lib.rs

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+pub mod ratio;

ratio_ops/src/ratio.rs

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+#[derive(Clone,Copy,Debug,Hash)]
+pub struct Ratio<Num,Den>{
+	pub(crate)num:Num,
+	pub(crate)den:Den,
+}
+impl<Num,Den> Ratio<Num,Den>{
+	pub const fn new(num:Num,den:Den)->Self{
+		Self{num,den}
+	}
+}