implements hello Cargo refs #3

.gitignore

@@ -0,0 +1,16 @@
+# Created by https://www.gitignore.io/api/rust
+# Edit at https://www.gitignore.io/?templates=rust
+
+### Rust ###
+# 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
+
+# End of https://www.gitignore.io/api/rust

Chapter1.3/hello_cargo/.gitignore

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+# Created by https://www.gitignore.io/api/rust
+# Edit at https://www.gitignore.io/?templates=rust
+
+### Rust ###
+# 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
+
+# End of https://www.gitignore.io/api/rust

Chapter1.3/hello_cargo/Cargo.toml

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+[package]
+name = "hello_cargo"
+version = "0.1.0"
+authors = ["euledge"]
+edition = "2018"
+
+[dependencies]

Chapter1.3/hello_cargo/src/main.rs

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