Add Cargo metadata to godot-cell

Author: Bromeon

godot-cell/Cargo.toml

@@ -2,6 +2,10 @@
 name = "godot-cell"
 version = "0.1.0"
 edition = "2021"
+rust-version = "1.70"
+license = "MPL-2.0"
+keywords = ["gamedev", "godot", "engine", "ffi"]
+categories = ["game-engines", "graphics"]
 
 [features]
 proptest = ["dep:proptest"]