Create a new binary package for cargo-typify

This creates a new binary package to use and adds it to the workspace.

Unfortunately there doesn't seem like a good way to make it the default
run command for the entire workspace.
See this issue for more details: rust-lang/cargo#7290

Cargo.toml

@@ -4,6 +4,7 @@ members = [
 	"typify-impl",
 	"typify-macro",
 	"typify-test",
+	"cargo-typify",
 	"example-build",
 	"example-macro",
 ]

cargo-typify/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "cargo-typify"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

cargo-typify/src/main.rs

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