Add front_end skeleton project

front_end/.gitignore

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+/target

front_end/Cargo.toml

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

front_end/src/main.rs

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