project: add Cargo project files

Those files were generated using `cargo init pathtracer`.

.gitignore

@@ -0,0 +1,10 @@
+/target
+**/*.rs.bk
+
+
+#Added by cargo
+#
+#already existing elements are commented out
+
+#/target
+#**/*.rs.bk

Cargo.toml

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+[package]
+name = "pathtracer"
+version = "0.1.0"
+authors = [
+    "Bruno BELANYI <brunobelanyi@gmail.com>",
+    "Antoine Martin <antoine97.martin@gmail.com>"
+]
+edition = "2018"
+description = "A pathtracer written in Rust"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

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