Merge pull request #1 from tobyatgithub/chap1.0

finished chapter 1, hello world and hello cargo. I like cargo...

projects/hello_cargo/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "hello_cargo"
+version = "0.1.0"

projects/hello_cargo/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "hello_cargo"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

projects/hello_cargo/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

projects/hello_world/main.rs

@@ -0,0 +1,4 @@
+fn main() {
+    // ! means calling a macro instead of a normal function
+    println!("Hello, world!");
+}