Add russimp into catalog (#612)

russimp is a rust bindings to `assimp`, a very popular 3d asset import library written in C/C++, which is leveraged by a number of game engines

Author: HydrogenC

content/ecosystem/data.toml

@@ -1292,6 +1292,11 @@ name = "rune"
 source = "crates"
 categories = ["scripting"]
 
+[[items]]
+name = "russimp"
+source = "crates"
+categories = ["3dformatloaders"]
+
 [[items]]
 name = "Rust-GPU/rust-gpu"
 source = "github"