chore: add license, description

.gitignore

@@ -3,6 +3,7 @@
 # will have compiled files and executables
 debug/
 target/
+.idea/
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html

Cargo.toml

@@ -2,6 +2,8 @@
 name = "tiny-encrypt"
 version = "0.0.0"
 edition = "2021"
+license = "MIT"
+description = "A simple and tiny file encrypt tool"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html