Fill out cargo.toml for conrod_vulkano

Author: mitchmindtree

backends/conrod_vulkano/Cargo.toml

@@ -6,6 +6,14 @@ authors = [
     "Kurble",
     "Abendstolz",
 ]
+keywords = ["ui", "widgets", "gui", "interface", "graphics"]
+description = "An easy-to-use, 100% Rust, extensible 2D GUI library."
+license = "MIT OR Apache-2.0"
+readme = "../../README.md"
+repository = "https://github.com/pistondevelopers/conrod.git"
+homepage = "https://github.com/pistondevelopers/conrod"
+documentation = "https://docs.rs/conrod"
+categories = ["gui"]
 edition = "2018"
 
 [dependencies]