Add 'start a new project' page

Fixes #102

Author: steveklabnik

foo/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "foo"
+version = "0.1.0"
+authors = ["steveklabnik <steve@steveklabnik.com>"]
+
+[dependencies]

foo/src/main.rs

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

src/SUMMARY.md

@@ -5,6 +5,7 @@
 ## What are editions?
 
 - [What are editions?](editions/index.md)
+  - [Creating a new project](editions/creating-a-new-project.md)
   - [Transitioning your code to a new edition](editions/transitioning-your-code-to-a-new-edition.md)
 
 ## Rust 2015

src/editions/creating-a-new-project.md

@@ -0,0 +1,35 @@
+# Creating a new project
+
+When you create a new project with Cargo, it will automatically add
+configuration for the latest edition:
+
+```rust
+> cargo +nightly new foo
+     Created binary (application) `foo` project
+> cat .\foo\Cargo.toml
+[package]
+name = "foo"
+version = "0.1.0"
+authors = ["your name <you@example.com>"]
+edition = "2018"
+
+[dependencies]
+```
+
+That `edition = "2018"` setting will configure your package to use Rust 2018.
+No more configuration needed!
+
+If you'd prefer to use an older edition, you can change the value in that
+key, for example:
+
+```rust
+[package]
+name = "foo"
+version = "0.1.0"
+authors = ["your name <you@example.com>"]
+edition = "2015"
+
+[dependencies]
+```
+
+This will build your package in Rust 2015.