chore: added README.md

frontends/libretro/Cargo.toml

@@ -6,6 +6,7 @@ description = "A Lib Retro frontend for Boytacen"
 license = "Apache-2.0"
 keywords = ["gameboy", "emulator", "rust", "libretro"]
 edition = "2018"
+readme = "README.md"
 
 [lib]
 crate-type = ["cdylib"]

frontends/libretro/README.md

+# Boytacean Libretro
+
+## Build
+
+```bash
+cargo build
+```