Stub the kernel binary crate

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+/target/
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+#Cargo.lock
+# These are backup files generated by rustfmt
+**/*.rs.bk

Cargo.lock

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

Cargo.toml

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+[workspace]
+
+members = [
+    "kernel",
+]

kernel/Cargo.toml

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+[package]
+name = "kernel"
+version = "0.1.0"
+authors = ["Guillaume DIDIER <guillaume.didier@polytechnique.edu>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

kernel/src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}