Add description to risc0 adapter

Author: preston-evans98

adapters/risc0/Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "sov-risc0-adapter"
 authors = { workspace = true }
+description = "An adapter allowing Risc0 to be used with the Sovereign SDK"
 edition = { workspace = true }
 homepage = { workspace = true }
 license = { workspace = true }