Update Cargo.toml

Author: aleokdev

Cargo.toml

@@ -2,6 +2,9 @@
 name = "space_alloc"
 version = "0.1.0"
 edition = "2021"
+license = "MIT OR Apache-2.0"
+description = "General purpose space allocators"
+categories = ["algorithms"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html