feat: cargo build files and expected dependencies

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "nostr-rs-relay"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+log = "0.4.14"
+env_logger = "0.9.0"
+tokio = { version = "1.14.0", features = ["full"] }
+futures = "0.3.18"
+futures-util = "0.3.18"
+tokio-tungstenite = "0.16.0"
+tungstenite = "0.16.0"
+thiserror = "1.0.30"
+uuid = { version = "0.8", features = ["v4"] }
+
+bitcoin_hashes = { version = "0.9.7", features = ["serde"] }
+secp256k1 = { version = "0.20.3", features = ["rand", "rand-std", "serde", "bitcoin_hashes"] }
+serde = { version = "1.0.130", features = ["derive"] }
+serde_json = "1.0.72"
+rusqlite = "0.26.1"

rustfmt.toml

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+edition = "2018"

src/main.rs

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