Update Cargo.toml

Cargo.toml

@@ -3,6 +3,11 @@ name = "nbody_barnes_hut"
 version = "0.1.0"
 authors = ["Stephen <webmaster@scd31.com>"]
 edition = "2018"
+description = "Facilitates 2D/3D n-body simulations in O(nlogn) time"
+license = "MIT"
+repository = "https://git.scd31.com/stephen/nbody_barnes_hut"
+categories = ["simulation", "algorithms"]
+keywords = ["gravitational", "gravity", "electrostatic"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html