feat(tvix/eval): check in generated project skeleton

Change-Id: Iecc8283abb289de71f22076fd88892f6ded99cb3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6062
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

tvix/eval/.gitignore

@@ -0,0 +1 @@
+/target

tvix/eval/Cargo.lock

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

tvix/eval/Cargo.toml

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+[package]
+name = "tvix-eval"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

tvix/eval/src/main.rs

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