Add description (#323)

Author: XAMPPRocky

crates/spirv-std/Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Embark <[email protected]>"]
 edition = "2018"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/EmbarkStudios/rust-gpu"
+description = "Standard functions and types for SPIR-V"
 
 [dependencies]
 glam = { version = "0.11.1", default-features = false, features = ["libm"] }