IronDrop: pin license and add description

Author: dev-harsh1998

Cargo.toml

@@ -2,6 +2,9 @@
 name = "irondrop"
 version = "2.5.0"
 edition = "2021"
+license = "GPL"
+license_file = "LICENSE"
+description = "Drop files, not dependencies - a well tested & battle-ready server in a single Rust binary"
 
 [dependencies]
 clap = { version = "4.5.6", features = ["derive"] }